The Seattle Longitudinal Study, conducted in 1956, found that primary mental abilities tend to improve until the late thirties or early forties, and begin to decline thereafter.

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The statement is true. The Seattle Longitudinal Study, conducted over several decades, found that primary mental abilities tend to improve until the late thirties or early forties, and then gradually begin to decline. However, the decline is generally mild and individuals can maintain their cognitive abilities through continued intellectual stimulation and healthy lifestyle choices.

The Seattle Longitudinal Study, Conducted in 1956, Found That Primary