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Some studies suggest IQ may decline with age due to factors like physical health, while other studies indicate overall IQ remains stable, though specific aspects like Performance IQ may change.
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The relationship between age and IQ has been a subject of extensive research. Various studies have explored how IQ changes over the lifespan, considering factors such as heritability, health, and specific conditions like Williams syndrome. This synthesis aims to present a cohesive understanding of how IQ is affected by age based on multiple research findings.
Heritability and Stability of IQ with Age:
Impact of Health on IQ:
IQ Stability in Specific Conditions:
Effects of Whole-Brain Irradiation:
Longitudinal Changes in IQ:
The research indicates that while the heritability of IQ increases and stabilizes in early adulthood, various factors influence IQ changes later in life. Physical health significantly mediates the decline in fluid intelligence, whereas crystallized intelligence remains relatively unaffected by health. Specific conditions like Williams syndrome show stable IQ with age, and external factors such as whole-brain irradiation can lead to IQ decline, particularly in younger individuals. Overall, IQ tends to decline moderately with age, with performance-related aspects being more affected than verbal aspects.
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