Intellectual Performance of Octogenarians as a Function of Education and Initial Ability

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Abstract
A 20-year follow-up of 54 octogenarians, tested originally at a mean age of 64 years, revealed that the initially more able (estimated by vocabulary score) declined less on tests in a cognitive battery than did the initially less able. When classification was based on level of education rather than initial ability, the better educated showed the lesser decline. It is postulated that continuedintellectual activity throughout the life span may protect against intellectual decline.

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