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past one's prime

Beyond the peak of one's powers, as in Jean still plays tennis but at 79 she's obviously past her prime. Also see the synonym over the hill; prime of life.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.