2 papers analyzed
Some studies suggest IQ stops increasing around 18-20 years of age, while other studies suggest intelligence levels can increase up to age 52.
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.
Heritability and Stability of IQ:
Long-term Stability and Change:
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.
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