at what age does your iq stop increasing

Introduction

The development of intelligence and its trajectory over a person's lifespan is a topic of significant interest in psychological and educational research. Understanding at what age IQ stops increasing can provide insights into cognitive development and inform educational and developmental strategies.

Key Insights

Heritability and Stability of IQ:
- The heritability of IQ increases with age, reaching an asymptote at about 0.80 between 18-20 years and continuing at that level into adulthood. Shared environmental influences decrease across age, approximating about 0.10 at 18-20 years and remaining stable into adulthood.
Long-term Stability and Change:
- Over a 40-year period from age 12 to age 52, the rank ordering of individuals' intelligence levels remains remarkably stable. However, there is a substantial increase in the variance of general cognitive ability (g), indicating that while individual rankings remain stable, the differences between individuals' cognitive abilities widen over time.

Conclusion

IQ tends to stabilize in late adolescence, around 18-20 years of age, with heritability reaching a peak and remaining stable into adulthood. While the rank ordering of intelligence remains stable over a long period, the differences in cognitive abilities among individuals can increase, reflecting a widening gap in cognitive performance as people age.

At what age does your iq stop increasing

Summary

Introduction

Key Insights

Conclusion

Sources and full results

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.

Stability and change in intelligence from age 12 to age 52: results from the Luxembourg MAGRIP study.

Intelligence levels increase from age 12 to age 52, with all broad abilities showing greater gap-widening effects and more closely related to each other at age 52.

Very low birth weight infants: effects of brain growth during infancy on intelligence quotient at 3 years of age.

Brain growth at 8 months significantly influences IQ at 3 years of age in very low birth weight infants, even when medical and sociodemographic factors are controlled.

The relationship between age and IQ in adults with Williams syndrome.

Adults with Williams syndrome show a stable overall IQ, but Performance IQ increases with age, suggesting that overall IQ may remain stable.

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.

Childhood IQ and all-cause mortality before and after age 65: prospective observational study linking the Scottish Mental Survey 1932 and the Midspan studies.

Childhood IQ is significantly related to deaths before age 65, but not to deaths after age 65.

IQ as Moderator of Terminal Decline in Perceptual and Motor Speed, Spatial, and Verbal Ability: Testing the Cognitive Reserve Hypothesis in a Population-Based Sample Followed From Age 70 Until Death

Higher IQ is associated with a delayed onset of terminal decline in cognitive abilities, such as speed and verbal ability, and a steeper decline rate in those abilities.

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.

Changes in thickness and surface area of the human cortex and their relationship with intelligence.

Higher intelligence is associated with thinner cortexes and faster thinning of the brain, with the cortex continuing to develop and expand intelligence-dependently.

Predicting IQ Change in Preschoolers with Developmental Delays

Initial diagnosis may help predict IQ change in young children with developmental delays, as initial diagnosis may help differentiate between potential IQ gains and mental retardation.

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