The body is most fully developed from
thirty to thirty-five years of age, the mind at about forty-nine. Let this
suffice for youth, old age, and the prime of life, and the characters which
belong to each.
Aristotle in 23 Volumes, Vol. 22, translated by J. H. Freese. Aristotle. Cambridge and London. Harvard University Press; William Heinemann Ltd. 1926.
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