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Updated: June 11, 2025
Dorland's study shows that in a list of four hundred fairly representative great men, only 10.25% ceased their mental activity between the ages of forty and fifty; 20.75% between fifty and sixty; 35% between sixty and seventy; 22.5% between seventy and eighty; and 6% after eighty. W.A. NEWMAN DORLAND, The Age of Mental Virility. New York: The Century Company, 1908.
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