ˌmiddle ˈage BrE AmE noun [uncountable]
the period of your life between the ages of about 40 and 60, when you are no longer young but are not yet old:
Men who smoke are more likely to have heart attacks in middle age.
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COLLOCATIONS
■ adjectives
▪ early middle age (=around age 40)
Two women in early middle age sat next to him.
▪ late middle age (=around age 60)
a well-dressed man in late middle age
■ verbs
▪ approach middle age (=be almost middle-aged)
a stocky, balding man who was approaching middle age
▪ reach middle age (=be middle-aged)
You need to start saving for retirement before you reach middle age.
▪ be well into middle age (=be obviously middle-aged, probably at least 50)
Most of the people there were well into middle age.