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9 papers analyzed
These studies suggest that IQ generally remains stable with age, though specific abilities and performance IQ may show changes, and heritability of IQ increases while shared environmental influence decreases.
20 papers analyzed
The relationship between IQ and age has been a subject of extensive research, with various studies examining how IQ changes over the lifespan. This synthesis aims to present key insights from multiple research papers on this topic, focusing on the stability and variability of IQ across different age groups.
Heritability and Environmental Influence:
Stability of IQ Over Time:
Age-Related Changes in Specific Abilities:
Generational and Cohort Effects:
Sex Differences:
The research indicates that while IQ remains relatively stable over the lifespan, specific cognitive abilities may change differently with age. Heritability of IQ increases, and environmental influences decrease as individuals grow older. Fluid intelligence tends to decline, whereas crystallized intelligence remains stable or improves. Generational and cohort effects also play a role in the age-IQ relationship, and there are some sex differences in IQ changes over time. Overall, the stability of IQ is a consistent finding across various studies.
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