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Phrase(s): Life begins at forty.
Prov. By the time you are forty years old, you have enough experience and skill to do what you want to do with your life. (Often said as an encouragement to those reaching middle age.) • Alan: Why are you so depressed? Jane: Tomorrow’s my fortieth birthday. Alan: Cheer up! Life begins at forty. • For Pete, life began at forty, because by that time he had enough financial security to enjoy himself now and then, rather than having to work all the time.
McGrawhill's American Idioms And Phrasal Verbs