10 papers analyzed
These studies suggest that IQ becomes stable around age 11 and remains stable into old age.
The stability of intelligence (IQ) over the lifespan is a critical area of research in psychology and cognitive science. Understanding when IQ becomes stable can provide insights into cognitive development, the impact of early interventions, and the predictability of future cognitive abilities.
Early Childhood Stability:
Adolescence to Adulthood:
Long-Term Stability:
Impact of Early IQ on Later Life:
Special Populations:
IQ becomes relatively stable around the age of 4 years, with significant stability observed from adolescence into adulthood. The heritability of IQ peaks around 18-20 years and remains consistent thereafter. Early IQ scores are strong predictors of future cognitive abilities and life outcomes, underscoring the importance of early cognitive assessments.
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