The IQ test for 30 year olds: how a 30 to 39 year old is scored, retested and compared with a childhood label

0 The short answer

No IQ test is built for people aged 30 to 39, so a 30 year old takes an adult battery, and the decisive point is that the score is read against adults of a similar age and not against one fixed standard for everyone. Pearson lists the WAIS-5 for ages 16:0 to 90:11, and ACIS is one online option with adult norms for ages 16 to 90, at 15, 30 or 50 dollars for about 45, 110 or 175 minutes (prices read October 29, 2026). In group data, working memory peaked at around 30 years, after processing speed and before vocabulary, and those curves describe groups, not the reader. An online score is unsupervised and not clinical, and it cannot promise a career, an admission or a diagnosis.

1 Which IQ Test Can Someone in Their 30s Take, and What Does Each Route Cost?

There is no separate IQ test for the thirties, so the real choice is among four adult routes: a psychologist with a Wechsler battery, a supervised society exam, a free screener, or a normed online battery. The age floors that matter sit far below the decade. Pearson's WAIS-5 product page, which we read on October 29, 2026, gives an age range of 16:0 to 90:11, meaning 16 years 0 months through 90 years 11 months, a qualification level of C and a publication date of 2024. American Mensa says on its testing page, read the same day, that it cannot offer testing to anyone under 14. ACIS norms cover ages 16 to 90. Nothing on those pages treats 30 as a boundary, so a 30 year old and a 39 year old can sit the same instruments, and the page on IQ tests for adults covers the general adult case before age enters the picture.

The table sets the routes side by side. The cost column holds only figures we opened on October 29, 2026.

Pearson's listing puts the print WAIS-5 complete kit at 1,784 dollars, which marks it as a professional product and explains little of what a client pays. We did not find a published adult fee for a WAIS-5 evaluation in a source we could open, so we state none and suggest asking a clinic for a written quote. The page on where to take an IQ test lists the in person and online routes together.

The Mensa route is the cheapest supervised one we could verify, and it answers one question only. Its page lists regular prices of 60 dollars for a proctored local session and 99 dollars for private electronic testing (it also displayed a limited promotion, which we do not quote), says a qualifying score is at or above the 98th percentile of the general population, and says the organization cannot provide a detailed report with scores, percentile ranks or an IQ score. That suits a person who wants membership and not a profile of strengths.

Free screeners sit at the other end. The useful question is in the table: does the page say whom the score is compared with, and does it say anything about age? A number with no named reference group is a game score, and the page on free IQ tests sets out what a free route includes. The ACIS free trial needs no card and allows one trial per person. The page on the best online IQ tests compares the online options a 30 year old is likely to meet.

ACIS charges once. Quick is 15 dollars for 6 subtests in 3 domains and about 45 minutes, Optimized is 30 dollars for 13 subtests in 5 domains and about 110 minutes, and Full Scale is 50 dollars for all 20 subtests in six domains and about 175 minutes, with no subscription. A Custom Test costs 5 dollars per subtest, and at 10 subtests the Full Scale form costs the same. Every form reports a Full Scale IQ with its 95 percent confidence interval. The refund policy, quoted literally, is: "Full refund within 5 days if the report does not deliver the features described at checkout or a technical issue prevents you from accessing your results." That is a conditional guarantee, not an unconditional money back one.

2 How Do Age Norms Work for Ages 30 to 39?

An age normed score places a person among people of a similar age, so a score of 100 means average for the person's own age band and says nothing about how the person compares with every adult at once. A publisher tests a large sample, groups it by age, converts raw scores to scaled scores inside each group, and combines scaled scores into indices and a Full Scale IQ on the standard scale, with a mean of 100 and a standard deviation of 15. The page on how IQ scores are normed walks through the process, and the page on average IQ by age explains why the reference group matters.

That answers a question many readers type: what is the average IQ for a 30 year old? On an age normed test, the answer is built into the scale, since the average for the age band is set at 100. The more useful question is how raw performance differs between a 30 year old and a 20 year old on each ability, and the next section takes that up. The age bands themselves have a history. Hartshorne and Germine, in their 2015 paper in Psychological Science, note that early IQ tests lumped together all persons aged 16 and over into one category called "adult," and that the WAIS-III now provides a distribution of scaled scores for each age group. Their analysis used the WAIS-III standardization sample of 2,450 healthy Americans aged 16 to 89, with 200 participants in each of these bins: 16 to 17, 18 to 19, 20 to 24, 25 to 29, 30 to 34, 35 to 44, 45 to 54, and so on up to 75 to 79.

Two details matter for a reader in their thirties. First, in that older edition the decade was split in two: ages 30 to 34 formed one bin, and ages 35 to 44 formed another that also covered the early forties. A 38 year old and a 43 year old were therefore compared with the same group. Second, the WAIS-III is a superseded edition. We did not find the WAIS-5 norm bands stated in the material we read, so we state none, and we offer the WAIS-III bins only as a documented example of how one adult battery handled the decade. The neighbouring decades have their own pages: the page on IQ tests for young adults covers ages 18 to 29, and the page on IQ tests for adults over 40 covers ages 40 to 59.

The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014), read in the open access edition, set the rule. Standard 5.8 says norms, if used, should refer to clearly described populations that include the individuals or groups with whom test users will ordinarily wish to compare their examinees. Its comment says differentiated norms or summary information about differences between gender, racial and ethnic, language, disability, grade or age groups may be useful in some cases, and that users need to be alerted to situations in which norms are less appropriate for some groups or individuals than others.

A reader who asks about an IQ test for a 35 year old woman will not find a separate version: none of the Pearson, Mensa or ACIS pages we read describes one, and what changes the comparison is the age band, the instrument and the conditions. Whether a publisher offers any differentiated norms is a question for its documentation, which for ACIS is the technical manual, and we state nothing about it here beyond that pointer.

3 What Changes Between the 20s and the 30s?

By the group evidence, the turn from the twenties into the thirties is where abilities part ways: processing speed has already peaked, working memory is peaking, and learned knowledge is still rising. The strongest single source is the Hartshorne and Germine paper, which combined a re-analysis of the WAIS-III and WMS-III standardization data with web experiments. Their abstract reports 48,537 web participants and says the results show considerable heterogeneity in when abilities peak: some peak and begin to decline around high school graduation, some plateau in early adulthood and begin to decline in the 30s, and others do not peak until the 40s or later. The abstract describes the evidence as convergent across two kinds of data, and its age comparisons are cross-sectional: different people of different ages, not the same people followed over time.

The specific results that bear on a 30 year old are these. In the WAIS-III norm data, digit symbol coding, the processing speed task, peaked in the late teens, digit span peaked in the early twenties, and vocabulary peaked around age 50. In the first web experiment, 10,394 participants aged 10 to 69 completed digit symbol coding, visual working memory, forward digit span and vocabulary. The two working memory tasks peaked at around 30 years, significantly later than processing speed and significantly earlier than vocabulary. The authors replicated the working memory result in separate datasets of 12,073 and 8,300 participants. Vocabulary peaked later in the web sample, at about 65, than in the WAIS-III data, at about 50, and a further analysis of 26,850 people who took a 10 question vocabulary test between 1974 and 2012 showed visibly later peaks in each successive period. The authors offer more than one explanation, including cohort differences and confounds in one or both datasets.

Two cautions keep the table in proportion. The authors write that cross-sectional data may be subject to cohort effects, and they tested the worry by comparing datasets collected about 20 years apart: digit span and digit symbol coding showed similar ages of peak performance in all of them, while vocabulary did not. And the numbers describe raw performance on specific tasks, not IQ scores. A group that peaks near 30 on working memory does not mean a particular 30 year old is at a peak, or that a 38 year old is past one.

A second line of evidence agrees on timing. In "When does age-related cognitive decline begin?" (Neurobiology of Aging, 2009), Salthouse reports that cross-sectional comparisons consistently show lower performance with higher age even in the range of 18 to 60 years, and argues that longitudinal studies seem to disagree partly because people tested again benefit from prior test experience, which masks age-related declines. His conclusion is that some aspects of age-related cognitive decline begin in healthy educated adults in their 20s and 30s. Read together, the two papers say that a person in their thirties is not on a plateau: some abilities are at their highest, some may be starting to change slowly, and some are still rising.

Hartshorne and Germine note that many studies treat "typical adults," usually aged 18 to 35, as a stable reference group, and that this intuition cannot be quite right. For a reader the consequence is modest. A standard score already compares a person with peers, so the average slowing of speed across the decade does not push a score down by itself. What can happen is a profile in which a knowledge index sits above a speed index. The page on how IQ changes with age sets out the evidence for the whole life span, and the page about IQ tests for seniors takes up the later decades.

4 What Does an IQ Test Measure at This Age, and Which ACIS Subtests Carry It?

A battery samples several broad abilities of the Cattell-Horn-Carroll (CHC) model, and in the thirties four of them are worth reading separately because the group curves above differ for each: crystallized ability (Gc), working memory (Gwm), processing speed (Gs) and fluid reasoning (Gf). The page on the CHC model defines the abilities. In short, Gc is the breadth and depth of acquired knowledge and verbal reasoning, Gwm is holding and manipulating information for a few seconds, Gs is fast, accurate performance on simple tasks under a clock, and Gf is solving unfamiliar problems. ACIS reports them as indices: the Verbal Comprehension Index, the Working Memory Index, the Processing Speed Index and the Fluid Reasoning Index, alongside the Quantitative Reasoning and Visual Spatial indices. We describe formats below as each subtest page describes them and reproduce no items from any test.

Knowledge comes first because it is the ability the group studies place latest. Vocabulary shows 45 words, one per item, and the person types a definition or meaning, with 1 minute 30 seconds per item before the screen advances. Information shows 30 questions about the world, typed in a text box, with 30 seconds per item. Both are Gc tasks. They depend on reading, schooling and conversation over many years, which is why the peak ages in the research above arrive later than for speed or working memory.

Speed and working memory come next, and they are the abilities where raw performance is most tied to age. Coding is a processing speed task: the person matches symbols to numbers with on-screen buttons, with 120 seconds on the clock after three unscored practice items. Symbol Search is the second speed task: the person decides whether a target symbol appears in a set or clicks NO, with 80 puzzles, a 2 minute limit and a penalty for wrong answers. Digit Span is a working memory task presented as audio in three sections, forward recall, backward recall and putting digits in order, and it needs working sound.

Fluid reasoning is the fourth. Matrix Reasoning is a nonverbal Gf task in which the person works out a rule in a visual pattern, and its page describes the problems as sampling abstraction, logic and nonverbal reasoning.

The ACIS technical manual says that verbal and knowledge tasks are affected by English proficiency and educational exposure. For a person in their thirties that line has a plain consequence. A reader who learned English as an adult, or who left school early, should expect a knowledge index to reflect that history as well as ability, and should read it beside the fluid reasoning and working memory indices.

5 What Career Decisions Can a Score Inform in Your 30s?

A score can be one input into a career question, and research links intelligence to education, occupation and income across groups, but no score chooses a path, the link is far from perfect, and ACIS is not for hiring. A reader in their thirties may arrive with a decision in mind, such as a change of field, a return to study or a promotion. The best summary of the group evidence is the meta-analysis by Strenze in Intelligence (2007), which pooled longitudinal studies that measured intelligence first and success later. Its sample size weighted and corrected correlations of intelligence with education, occupation and income were .56, .43 and .20, from 59, 45 and 31 samples. Its abstract concludes that intelligence is a powerful predictor of success but, on the whole, not an overwhelmingly better predictor than parental socioeconomic status or school grades.

One detail makes the study relevant to this decade. Strenze argued that people under 30 cannot yet be reliably classified as more or less successful, so his "best studies" kept only samples with an average age under 19 at testing and over 29 when success was measured. In those, the correlations were .56, .45 and .23. A correlation of .20 for income squares to .04, which is our arithmetic and not a figure the paper reports, and it means that about 4 percent of the variation in income lines up with the score while the rest does not. These are group figures for people tested in youth, not a prediction from a score taken at 34.

A separate literature asks how well tests predict job performance in hiring, and its message is cautionary. Sackett and colleagues, in the Journal of Applied Psychology (2022), conclude in their abstract that the validity of many selection procedures for predicting job performance has been substantially overestimated, and that revised mean validity estimates are lower by .10 to .20 points. That paper concerns hiring procedures, not personal career choices, and it shows that even well supported claims here have been revised downward. ACIS is not for hiring, and the practice tests sold for job screening are built for a different purpose from an IQ battery.

The Standards for Educational and Psychological Testing state the principle behind that limit. Standard 1.0 says each intended interpretation of a test score for a specified use needs appropriate validity evidence, and the comment to Standard 1.1 says no test permits interpretations that are valid for all purposes or in all situations. A career interpretation of an IQ score is one use among many, and it needs its own evidence. The page on IQ tests and career guidance takes the question further, and a reader weighing enlistment will find that route on the page about the military IQ test.

Returning to study is a common decision in the thirties, and one meta-analysis speaks to it with care. Ritchie and Tucker-Drob, in Psychological Science (2018), pooled 142 effect sizes from 42 data sets in quasi-experimental designs and found beneficial effects of education on cognitive abilities of approximately 1 to 5 IQ points for an additional year of education, with effects that persisted across the life span. The abstract does not say the studies followed adults who went back to school in their thirties, so we draw no promise for a degree at 35. It supports a narrower statement: schooling and measured ability are linked in both directions, and a score is not a fixed trait of a person.

6 Can a Childhood Gifted Score Be Compared With a Score in Your 30s?

A childhood gifted score and an adult score are not a before and after, because they come from different tests, different norm groups and different ages, although the rank order of people on cognitive tests is substantially stable across long gaps. Deary and colleagues, in Intelligence (2000), describe their study as the longest follow-up of psychometric intelligence reported to date. Of the 87,498 Scottish children who took the Moray House Test in 1932, the authors followed up 101 at age 77 with the same test. The correlation between scores at 11 and 77 was 0.63, which became 0.73 when corrected for the narrower range of ability among the retested people. The authors conclude that mental ability differences show substantial stability from childhood to late life.

The wider picture is in the meta-analysis by Breit and colleagues in Psychological Bulletin (2024), which used 205 longitudinal studies with 87,408 participants. For an age of 20 years and an interval of 5 years the mean rank-order stability was .76. Stability was low in preschool children, rose rapidly in childhood, and was consistently high from late adolescence to late adulthood. It declined with longer intervals, and the decline flattened from an interval of about 5 years onward. The authors also report that the stability they treat as sufficient for individual-level diagnostic decisions, a test-retest correlation of .80, can be expected only above age 7 and for short intervals in children. Read plainly, a score taken in childhood is a weaker guide to an adult score than a score taken in the twenties, and a gap of decades is far from a short interval.

The label also has to be understood as a decision, not only a number. The comment to Standard 12.10 of the Standards for Educational and Psychological Testing says a decision or characterization with major impact on a student should consider more than a single test, and it gives an example: it may not be advisable or lawful to accept students into a gifted program automatically on an IQ above 130 without considering other relevant information. A childhood label may therefore have rested on a program rule, a school reading of one score, or several sources. A reader who remembers only "I was tested" may not know which instrument was used.

Several reasons make a direct subtraction unreliable. The instrument is probably different, so the tasks and the reference group differ. The norms differ in time, which is the situation Standard 5.11 describes when it asks users to avoid out of date norms. Every score carries measurement error. Compare a new adult number with an old one only as two readings of rank, not as a loss or a gain. The page on IQ tests for former gifted kids takes up what to do with an old number, and the page on gifted tests for adults describes the adult route for a reader who wants to see where they stand now. A lower number today would not show that the label was wrong or that ability was lost, and a higher one would not show that it was right.

7 Does a Second Test Change the Score?

Taking cognitive tests again usually raises scores a little, and the authors of the main meta-analysis name several causes besides real change, so a second sitting of the same kind of test says less about change than the first. The best evidence is the meta-analysis by Scharfen, Peters and Holling in Intelligence (2018): 174 samples from 122 studies, 786 test outcomes and an overall sample size of 153,185. It found significant retest effects and no further score gains after the third administration. The standardized gain for the first retest was 0.33 standard deviations, rising to 0.50 at the third administration and 0.52 at the fourth. On a scale with a standard deviation of 15, 0.33 is about 5 points, which is our arithmetic, since the study reports its effects in standard deviation units.

Averages hide spread. The authors give the standard deviation of the true effect as 0.32 for the first retest, which implies a prediction interval from about minus 0.30 to 0.96. A gain of 5 points is therefore a typical figure, and a particular person can gain much more, gain nothing or lose ground. The paper's introduction lists the candidate causes: a real gain in the ability, a drop in construct-irrelevant factors such as test anxiety, lack of understanding of the rules and low familiarity, and test-specific strategies or memory for earlier items. The authors report that the type of ability, test content, equivalence of forms, retest interval and participant age all influence the size of the effect. The interval effect was weak: the first retest effect fell by about 0.04 standard deviations for every 50 weeks of delay, and older participants showed slightly smaller retest effects.

Salthouse's 2009 paper, cited above, supplies the other side of the coin. Prior test experience produces large positive effects that can mask real decline in longitudinal studies. For a reader in their thirties, that means a retest score reflects practice and ability together, and the two cannot be separated from one number.

A reader who took a school or clinic battery long ago and now takes an online test is sitting a different instrument for the first time, and we found nothing in the sources we read that estimates how much of a retest effect carries over from one instrument to another, so we offer no estimate. A reader who tries again after a disappointing result should expect part of any gain to come from the familiarity effects the authors describe, and a reader who wants to track change should keep the gap long, use the same kind of test under similar conditions, and expect movement in either direction. The page on retaking an IQ test explains why the second score so often runs higher.

The Standards for Educational and Psychological Testing note that communications to test takers should include policies on retesting, including when the test taker feels the present performance does not appropriately reflect true capabilities. A reader should read the terms shown at purchase before paying, and should not buy a second form in the hope of improving the first.

8 What Do Parents Ask About Their Own Scores?

Many readers in their thirties come to a test because of a child, and the evidence supports two plain statements: a parent's number does not tell what a child's will be, and an adult test is not a test for a child. One worry is whether a child's gifted label says something about the parent, and another is whether a parent's own result predicts the child's. Neither can be settled by one online score, and the research that bears on them is about groups.

The twin study by Haworth and colleagues in Molecular Psychiatry (2010) used about 11,000 pairs of twins from four countries. It found that the heritability of general cognitive ability increased from 41 percent at age 9 to 55 percent at age 12 and 66 percent at age 17. A heritability figure describes how much of the variation among people in a sample goes with genetic differences. It does not say how much of any one person's score came from genes, and it does not forecast the score of a particular child. The review by Nisbett and colleagues in American Psychologist (2012) lists among its findings that the heritability of IQ varies significantly by social class, and that the importance of the environment is established by the 12 to 18 point increase in IQ when children are adopted from working class to middle class homes. Neither paper lets a reader work out a child's future score from a parent's, because the first describes variation in large samples and the second says environment matters.

The label question is a matter of logic. A gifted label on a child is a measurement of the child, taken with the child's instrument at the child's age, and it carries no measurement of the parent. A parent who is curious can take an adult test for their own sake, and the same limits apply to that score as to any other: it is a reading of rank at one time, read against adults of a similar age.

Two limits on the other side deserve to be stated. ACIS norms cover ages 16 to 90, so it is not a test for a child, and we do not offer it as one. If a school or a pediatric clinic wants information about a child, that evaluation belongs with a qualified psychologist, and as the Standards note in the comment to Standard 12.10, a major decision about a student should rest on more than one test score.

9 How Should a Score in Your 30s Be Read?

A normed score places a person within an age group, and the useful reading combines the Full Scale IQ, the index profile, the percentile and the confidence interval, because no single number carries the whole result. Scores arrive on three scales. A scaled subtest score runs from 1 to 19, with a mean of 10 and a standard deviation of 3. An index score and the Full Scale IQ sit on the standard scale, with a mean of 100 and a standard deviation of 15. A percentile says what share of the reference group scored at or below the person. They are not interchangeable, and the page on IQ score versus percentile explains why they cannot be averaged. In our arithmetic from the normal curve, a standard score of 85 sits near the 16th percentile, 100 at the 50th, 115 near the 84th and 130 near the 98th. Those are not figures from any test.

The interval deserves more attention than it usually gets. As an illustration only, and not an ACIS figure, take a hypothetical interval from 108 to 118. In our arithmetic from the normal curve, 108 sits near the 70th percentile and 118 near the 88th, so the same result could describe a person a little above the middle or well above it.

Precision also depends on how much was measured. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) say in Standard 2.3 that for each total score, subscore or combination of scores that is to be interpreted, estimates of relevant indices of reliability and precision should be reported, and Standard 2.4 says that when an interpretation emphasizes differences between two observed scores of an individual, reliability data should be provided for such differences. A reader in their thirties who sees a speed index lower than a vocabulary index should keep both standards in mind. The comparison is against peers on each, the difference between two indices can be less precise than either index alone, and the page on index score differences shows how common such gaps are. The group peaks described earlier do not turn that gap into a decline.

Standard 10.12 adds that many factors, among them educational level, effort, employment status, health status, linguistic preference and the testing situation, may influence individual results, so a score is one source beside grades, work samples and a person's own sense of their strengths.

10 What Does an Unsupervised Session Need When Life Is Full?

An unsupervised session works when the conditions match what the test assumes: a quiet room, a working device with sound, enough time for the form, and a person who is rested and willing. The Standards for Educational and Psychological Testing are explicit about the risk. The comment to Standard 3.4 says unproctored test administrations, where standardization cannot be ensured, could provide an advantage to some test takers over others, and that results should then be interpreted with caution. The same comment says examinees working on older, slower equipment may be unfairly disadvantaged relative to those on newer equipment. The Standards also say the interpreter of test results should be informed if a test was unproctored.

Sound is the first requirement. Three ACIS subtests present their items as audio and need working sound: Digit Span, Alphanumeric Sequencing and Arithmetic. The Digit Span page recommends headphones or a quiet space, so a volume check belongs before the first subtest. The Coding and Symbol Search pages tell a phone user to rotate the device to landscape, and a reader who plans to sit a form on a phone should read the page on taking an IQ test on a phone first. The timed subtests run on a clock that the pages describe, such as 120 seconds for Coding, so the useful rule is to start one only when an interruption is unlikely.

Time and sleep are the second and third conditions. The forms take about 45 minutes for Quick, about 110 for Optimized and about 175 for Full Scale. ACIS allows breaks, saves progress between subtests and gives 30 days to complete a form, so a long form can be spread across several evenings. Sleep is the third. The meta-analysis by Lim and Dinges in Psychological Bulletin (2010) covered short-term total sleep deprivation, defined as under 48 hours, across 70 articles and 147 cognitive tests. Effect sizes ranged from small and nonsignificant, for reasoning accuracy at g of minus 0.125, to large, for lapses in simple attention at minus 0.776. Those are studies of total deprivation, not of an ordinary short night, so we draw no rule from them, but they support starting a session rested. The page on sleep and IQ covers the wider evidence.

The fourth condition is not getting help. The ACIS subtest pages say no external aids, such as calculators, notes or scratch paper, are allowed. A friend who reads along, a calculator on a quantitative task or a quick search for a word changes what is measured, and the report then describes the helped performance.

11 What Can a Score in Your 30s Not Do?

An IQ score cannot choose a career, document a condition, diagnose anything, stand in for a supervised evaluation or predict a life, and treating it as if it could is a misuse of the number. Each limit has a plain reason. For diagnosis, ACIS is not a clinical or diagnostic instrument, and group statistics, such as the peak ages in this page, describe populations and are never individual diagnoses. A reader who is worried about memory, attention or mood should see a licensed clinician, who can combine interviews, history and observation. For documentation, ACIS is not for hiring, school accommodations or admission to high IQ societies.

For the thirties in particular, the group research is the easiest thing to misuse. The papers cited here say that, on average, working memory peaks near 30 and that some aspects of change begin in the 20s and 30s. They do not say that a particular 36 year old is declining, or that a score has an expiry date at 40. The cross-sectional designs compare different people, the cohort worry is real, and a standard score already compares a person with peers. Salthouse and Hartshorne and Germine describe the shape of averages, and a report describes one person on one day.

Many products look like IQ tests and are not. Reaction time games, memory games and brain training apps measure something, but a number from one of them is not an IQ unless the product reports a norm referenced score and names its reference group. The page on the brain age test takes up brain age numbers, and a reader who has been offered a named instrument such as the Shipley-2 will find it on the page about the Shipley-2 test. An ACIS score is not interchangeable with a score from any other publisher's instrument.

Finally, a score says nothing about worth. A person in their thirties with a high number is not more valuable than one with a lower number, and neither has been told something final. The Standards remind users that interpretation should consider educational level, effort, health and the testing situation, which is another way of saying that a number is a reading under conditions, not a verdict on a person.

12 Where ACIS Sits, and What a Buyer Should Do

ACIS is one normed online option for an adult aged 30 to 39, with concrete strengths and plain limits, and the decision to use it belongs to the reader. The strengths are these. It offers a Full Scale IQ and six primary indices with percentiles and a 95 percent confidence interval, and it is a one time payment with no subscription: Quick is 15 dollars for 6 subtests in 3 domains and about 45 minutes, Optimized is 30 dollars for 13 subtests in 5 domains and about 110 minutes, and Full Scale is 50 dollars for all 20 subtests in six domains and about 175 minutes (prices read October 29, 2026, which can change). Its adult norms cover ages 16 to 90, and its documentation is in the technical manual. The refund policy is the conditional one quoted above.

The limits are as concrete. ACIS is online and unsupervised, it is not a clinical or diagnostic instrument, it is not for hiring, school accommodations or admission to high IQ societies, and it is English only. A psychologist's evaluation is the route when a professional needs documentation. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) put the user's responsibility in terms a buyer can apply: Standard 5.8 asks that norms refer to clearly described populations and that users know when norms are less appropriate for some individuals, the comment to Standard 3.4 asks for caution when administration is unproctored, Standard 2.3 asks for reliability evidence for each score that is interpreted, Standard 1.0 asks for validity evidence for each intended interpretation, and the comment to Standard 12.10 asks that a major decision about a student rest on more than one score. We cite them as the yardstick this page tries to meet and not as endorsements of ACIS.

A buyer in their thirties should do this, in order:

1. Decide the question. If an employer, a school or a clinic needs documentation, start with a licensed psychologist. If the question is personal, such as where you stand now, how an old childhood number compares or what your profile looks like, continue.
2. Pick the form that fits. Quick for a first look, Optimized for a broader profile, Full Scale for all six indices and the full set of 20 subtests. The comparison page named in the first section lays out the alternatives.
3. Start with the free trial. It needs no card and shows the format before anything is spent.
4. Set up the room. Quiet, working sound, a rested start and a plan for breaks, as the section on conditions describes.
5. Read the report as one source. Keep the confidence interval in view, compare the index profile and not only the total, and do not use the number for a decision it cannot support, such as a career change or a claim about a child.

13 Sources Behind This Page

Every figure above is traceable to one of the following, and each is linked at the point where it is used. Prices and age ranges were read on October 29, 2026 and can change. Any figure we derived ourselves is labeled in the text as our arithmetic.

• Pearson Assessments. Wechsler Adult Intelligence Scale, Fifth Edition (WAIS-5) product page. Age range, qualification level, publication year, completion times, norming language and kit price, read October 29, 2026.
• American Mensa. Testing page. Minimum age, qualifying percentile, regular prices, expected duration and what is reported, read October 29, 2026.
• American Educational Research Association, American Psychological Association and National Council on Measurement in Education. Standards for Educational and Psychological Testing. American Educational Research Association, 2014. Standards 1.0, 1.1, 2.3, 2.4, 3.4, 5.8, 5.11, 10.12 and 12.10 and their comments, and the comments on retesting and on unproctored administration, read in the open access PDF on October 29, 2026.
• Hartshorne J, Germine L. When Does Cognitive Functioning Peak? The Asynchronous Rise and Fall of Different Cognitive Abilities Across the Life Span. Psychological Science, 2015, volume 26, issue 4, pages 433 to 443. Full text in PubMed Central: PMC4441622.
• Salthouse T. When does age-related cognitive decline begin? Neurobiology of Aging, 2009, volume 30, issue 4, pages 507 to 514.
• Strenze T. Intelligence and socioeconomic success: A meta-analytic review of longitudinal research. Intelligence, 2007, volume 35, issue 5, pages 401 to 426.
• Sackett P, Zhang C, Berry C, Lievens F. Revisiting meta-analytic estimates of validity in personnel selection: Addressing systematic overcorrection for restriction of range. Journal of Applied Psychology, 2022, volume 107, issue 11, pages 2040 to 2068.
• Ritchie S, Tucker-Drob E. How Much Does Education Improve Intelligence? A Meta-Analysis. Psychological Science, 2018, volume 29, issue 8, pages 1358 to 1369.
• Deary I, Whalley L, Lemmon H, Crawford J, Starr J. The Stability of Individual Differences in Mental Ability from Childhood to Old Age: Follow-up of the 1932 Scottish Mental Survey. Intelligence, 2000, volume 28, issue 1, pages 49 to 55.
• Breit M, Scherrer V, Tucker-Drob E, Preckel F. The stability of cognitive abilities: A meta-analytic review of longitudinal studies. Psychological Bulletin, 2024, volume 150, issue 4, pages 399 to 439.
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