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English definition of “on the right/wrong side of 40, 50, etc.”

on the right/wrong side of 40, 50, etc.

looking younger/older than a particular age: She looks to me as if she's on the wrong side of 50.Describing age and birthdays
(Definition of on the right/wrong side of 40, 50, etc. from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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