average iq for different ages

Introduction

The relationship between age and intelligence quotient (IQ) has been a subject of extensive research. Various studies have examined how IQ changes across different age groups, considering factors such as sex differences, nonverbal IQ in specific populations, and the heritability of IQ over time.

Key Insights

Sex Differences in IQ Across Ages:
- At ages 7 and 11, girls have a slight IQ advantage over boys, but by age 16, boys show a small IQ advantage over girls.
Nonverbal IQ in Autism Spectrum Disorder (ASD):
- Individuals with ASD who scored in the intellectual disability range as children generally maintained similar scores into adulthood. However, those with average scores as children also maintained average scores into adulthood. Scores in the lower ranges tended to decline from age 2 to 19.
Heritability of IQ:
- The heritability of IQ increases with age, reaching an asymptote of about 0.80 by ages 18-20 and remaining stable into adulthood. Shared environmental influences decrease with age, stabilizing at around 0.10 by ages 18-20.
IQ in Juvenile Delinquents:
- The mean IQ of juvenile delinquents was found to be 84.45, with no significant sex differences. Boys aged 14 and over had a slightly higher mean IQ compared to those under 14, a trend not observed in girls.
IQ Across Adult Age Groups:
- When educational attainment is controlled, there is no significant decline in Verbal IQ from ages 20 to 74. However, Performance IQ and Full Scale IQ show declines across this age range, even after controlling for education.

Conclusion

Research indicates that IQ can vary across different ages and populations. Girls initially have a slight IQ advantage over boys, which reverses by age 16. In individuals with ASD, IQ scores tend to remain stable from childhood to adulthood, though lower scores may decline. The heritability of IQ increases with age, stabilizing in early adulthood. Juvenile delinquents have a mean IQ lower than the general population, with slight age-related differences in boys. In adults, while Verbal IQ remains stable when education is controlled, Performance and Full Scale IQ decline with age.

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Average iq for different ages

Summary

Introduction

Key Insights

Conclusion

Sources and full results

A longitudinal study of sex differences in intelligence at ages 7, 11 and 16 years

At age 16, boys have an IQ advantage of 1.8 IQ points over girls, supporting Lynn's hypothesis that males develop higher average intelligence than females.

Measurement of Nonverbal IQ in Autism Spectrum Disorder: Scores in Young Adulthood Compared to Early Childhood

Nonverbal IQ scores in individuals with autism spectrum disorder (ASD) generally remain within the average range from age 3 to 19, but actual scores decline from age 2 to 19.

The Wilson Effect: The Increase in Heritability of IQ With Age

The heritability of IQ increases with age, reaching an asymptote of 0.80 at 18-20 years of age and continuing at that level well into adulthood, while shared environmental influence decreases across age.

Age and intelligence of a group of juvenile delinquents

Boys aged 14 and over have a slightly higher mean IQ than those below 14 years, but no significant differences were found between sexes.

Age and WAIS-R intelligence in a national sample of adults in the 20- to 74-year age range: A cross-sectional analysis with educational level controlled

Intelligence declines in Performance IQ and Full Scale IQ from age 20 to 74, but not in Verbal IQ, even after controlling for education.

Children with superior intelligence at 7 years of age: a prospective study of the influence of perinatal, medical, and socioeconomic factors.

Favorable parental social and educational background, larger head size, and larger height and weight are the best correlates of superior intelligence in children aged 7 years.

Age and IQ at Intake as Predictors of Placement for Young Children with Autism: A Four- to Six-Year Follow-Up

Higher IQ and younger age predict regular education placement for children with autism, while lower IQ and older age are linked to special education placement.

Childhood IQ and survival to 79: Follow-up of 94% of the Scottish Mental Survey 1947

Higher childhood IQ is associated with lower risk of all-cause mortality in both men and women, with a slightly stronger effect in women and before age 65.

Age and IQ effects on stimulus and response timing

Increased age and decreasing IQ tend to increase variability in judgments of duration, but overall accuracy in timing tasks remains generally consistent across groups.

A Longitudinal Study of Cognitive Development in Young Children.

Superior IQ children show greater verbal ability, enabling them to explain their intuitive choices and correct choices, while less adequate children rely on perceptual configurations at both ages.

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