can iq increase with age

Introduction

The relationship between age and IQ has been a subject of extensive research. Various studies have explored how IQ changes over the lifespan, the factors influencing these changes, and the implications for cognitive and mental health.

Key Insights

Heritability and Stability of IQ with Age:
- The heritability of IQ increases with age, reaching an asymptote around 0.80 by 18-20 years and remaining stable into adulthood. Shared environmental influences decrease significantly by this age.
IQ and Cognitive Performance in Older Adults:
- Older adults (60-79 years) show increased variability in cognitive tasks with age, but their average performance remains accurate.
- Higher IQ in youth is associated with better mental health outcomes at age 50, although it also correlates with a higher risk of depression diagnosis.
- Early-life IQ contributes to better mental and physical health at age 70, often mediated by socioeconomic status (SES).
IQ and Subjective Age:
- Higher IQ in adolescence is linked to a younger subjective age in later life, suggesting that early cognitive ability influences how old individuals feel as they age.
IQ Stability in Specific Populations:
- In individuals with Williams syndrome, overall IQ remains stable with age, although Performance IQ may increase.
Age and Cognitive Differentiation:
- Age moderates the effect of IQ on the differentiation of cognitive abilities during childhood, with the strength of relationships among cognitive subtests evolving with age.
Effects of Aging and IQ on Memory and Decision Tasks:
- IQ has a significant impact on memory and decision-making tasks, with higher IQ associated with better performance. However, aging affects the speed and accuracy of these tasks, with older adults showing declines in certain cognitive processes .
Response Inhibition and Age:
- Response inhibition improves with age in children, but in institutionalized individuals with intellectual disabilities, motor inhibition varies with age while cognitive inhibition varies with IQ.

Conclusion

The research indicates that while IQ tends to stabilize in adulthood, its heritability increases with age. Higher IQ in youth is associated with better mental and physical health outcomes later in life, although it may also correlate with certain mental health risks. Cognitive performance in older adults shows increased variability, but average performance remains accurate. Specific populations, such as those with Williams syndrome, exhibit stable IQs with age. Overall, the relationship between age and IQ is complex, influenced by various factors including early-life cognitive ability, socioeconomic status, and individual differences in cognitive processes.

Can iq increase with age

Summary

Consensus Meter

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.

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.

Higher IQ in adolescence is related to a younger subjective age in later life: Findings from the Wisconsin Longitudinal Study

Higher IQ in adolescence is associated with a younger subjective age in later life, with openness acting as a mediator.

Intelligence in youth and mental health at age 50

Higher intelligence in youth is associated with reduced self-reported mental health problems at age 50, but an increased risk of depression by the age of 50.

Psychological and physical health at age 70 in the Lothian Birth Cohort 1936: links with early life IQ, SES, and current cognitive function and neighborhood environment.

High early-life IQ at age 11 can buffer the effects of adverse environments on physical and mental health problems in old age.

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.

Does age moderate the effect of IQ on the differentiation of cognitive abilities during childhood

IQ-related differentiation in cognitive abilities occurs during childhood, with higher IQ individuals showing stronger relationships among subtests as they age.

Effects of aging and IQ on item and associative memory.

Aging and IQ have complex interactions on item and associative memory, with IQ affecting drift rate and recall performance, while age has small effects on boundary separation and nondecision time.

Individual differences, aging, and IQ in two-choice tasks

Aging and IQ have larger effects on slower responses than faster responses in two-choice tasks, with IQ having a greater impact on the quality of evidence used for decisions.

The relationship of cognitive and motor response inhibition to age and IQ.

Response inhibition increases with age in children, while cognitive inhibition varies with IQ, not age, in both normal and retarded children.

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