The best or finest time of life, at the peak of good looks, good health, and vigor. “He hath the flower of youth, wherein is the fulness of strength,” wrote Homer in the Iliad (ca. 850 b.c.). Shakespeare used similar language, but not the precise wording of the cliché. But John Dryden did, in Alexander’s Feast (1697), describing the lovely Thais “in flow’r of youth and beauty’s pride.”