The Seattle Longitudinal Study and other research on cognitive function found that the largest average declines in intelligence come after age 60 but that intellectual decline in later life may be reversed.

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The Seattle Longitudinal Study and other research have indeed found that the largest average declines in intelligence come after age 60, but they have also suggested that intellectual decline in later life may be reversible through interventions such as cognitive training and education.

The Seattle Longitudinal Study and Other Research on Cognitive Function