Crystallized intelligence reaches its peak in the early 20s and declines thereafter.

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Crystallized intelligence, which refers to knowledge and skills that are acquired through education and experience, tends to increase and peak in the late 30s or early 40s, and may remain stable or decline slightly in old age. Fluid intelligence, which refers to problem solving and reasoning abilities, tends to peak in the 20s and declines thereafter.

Crystallized Intelligence Reaches Its Peak in the Early 20s and Declines