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English definition of “middle age”

middle age

noun [U] uk   us  
the period of your life, usually considered to be from about 45 to 60 years old, when you are no longer young, but are not yet old: Once you reach middle age, you have to be sensible with your health.Stages of life
(Definition of middle age from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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