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Meaning of midlife crisis

mid'life cri'sis

Pronunciation: [key]
  1. a period of psychological stress occurring in middle age, thought to be triggered by a physical, occupational, or domestic event, as menopause, diminution of physical prowess, job loss, or departure of children from the home.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.