average iq score by age

Introduction

The relationship between age and IQ scores has been a subject of extensive research. Understanding how IQ scores vary across different age groups can provide insights into cognitive development and decline over the lifespan. This synthesis examines findings from multiple studies to present a cohesive understanding of average IQ scores by age.

Key Insights

IQ Stability and Decline with Age:
- IQ scores, particularly Performance IQ and Full Scale IQ, tend to decline with age from 20 to 74 years, even when educational attainment is controlled for.
- Nonverbal IQ (NVIQ) scores in individuals with autism spectrum disorder (ASD) show a decline from age 2 to 19, especially within the lower ranges of ability.
Sex Differences in IQ:
- At ages 7 and 11, girls have a slight IQ advantage over boys, but by age 16, boys have a higher average IQ than girls.
Age-Adjusted IQ Estimation:
- Continuous norming techniques provide stable age-adjusted IQ estimates, which are recommended for clinical and research settings due to their accuracy and stability.
High IQ in Children:
- Children with above-average IQs (110-129) and superior IQs (above 130) outperform average children on executive function tests, indicating that higher intelligence significantly influences age-related cognitive performance.

Conclusion

Research indicates that IQ scores generally decline with age, particularly in the domains of Performance IQ and Full Scale IQ. There are notable sex differences in IQ scores, with girls initially having a slight advantage that shifts to boys by age 16. Age-adjusted IQ estimation methods are effective for providing accurate and stable scores. Additionally, children with higher IQs demonstrate superior cognitive performance compared to their average peers. These findings collectively highlight the dynamic nature of IQ across different age groups and the factors influencing these changes.

Average iq score by age

Summary

Introduction

Key Insights

Conclusion

Sources and full results

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.

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.

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.

Estimating WAIS IQ from the Shipley Institute of Living Scale using continuously adjusted age norms.

This study developed a reliable and stable procedure for estimating age-adjusted WAIS IQ scores from the Shipley Institute of Living Scale, providing a brief but accurate IQ estimate in clinical and research settings.

Wisconsin Card Sorting Test performance in above average and superior school children: relationship to intelligence and age.

Above average children outperform average 9- to 14-year-olds on the Wisconsin Card Sorting Test, with intelligence being a significant qualifier of age trends.

IQ scores among homeless older adolescents: characteristics of intellectual performance and associations with psychosocial functioning.

Higher IQ scores in homeless older adolescents are associated with less depression and delinquency, but also less self-control in high-risk sexual situations and a higher likelihood of HIV acquisition.

IQ Constancy and Age

IQ consistency and age show a perfect relationship, with correlations increasing with age, but no sex differences in IQ changes were observed.

Childhood IQ's as Predictors of Adult Educational and Occupational Status

Childhood IQ's can predict adult education and occupational status, but not long-term predictions for individual normal children.

Intellectual development from early childhood to early adulthood: The impact of early IQ differences on stability and change over time

Higher initial IQ scores maintain advantages throughout the study period, with low-IQ children showing higher stability over time and more likely to attend higher educational tracks.

Childhood IQ's as Predictors of Adult Educational and Occupational Status.

Childhood IQ's can predict adult education and occupational status, but not enough for practical purposes.

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