Schaie's research, which began in 1956, has shown that younger adults are smarter than older adults.

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Schaie's research, particularly his Seattle Longitudinal Study, primarily found that cognitive abilities do not uniformly decline with age. Instead, it showed that some abilities remain stable or even improve into middle age and beyond, challenging the notion that younger adults are universally "smarter" than older adults.

Schaie's Research, Which Began in 1956, Has Shown That Younger