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English definition of “middle age”

middle age

noun [U]    /ˈmɪd·əl ˈeɪdʒ/ (also midlife)
the period of your adult life from about 40 to 65 years old when you are no longer considered young but are not yet old middle-aged adjective a middle-aged couple
(Definition of middle age noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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as husband and wife

in the same way as two people who are married

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