the period of life between youth and old age, usually (in humans) considered to occur approximately between the ages of 40 and 60
WordReference Random House Learner's Dictionary of American English © 2026
ˈmid•dle ˈage, n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2026- the period of human life between youth and old age, usually considered as the years between 45 and 65.
mid′dle age′,
- the period of human life between youth and old age, sometimes considered as the years between 45 and 65 or thereabout.
- Middle English 1350–1400
Collins Concise English Dictionary © HarperCollins Publishers::
'middle age' also found in these entries (note: many are not synonyms or translations):
Alzheimer's disease
- Middle Ages
- age
- dry up
- elderly
- golden age
- grey
- life cycle
- male menopause
- medieval
- middle years
- middle-age spread
- middlescence
- midlife
- midlife crisis
- osteoarthritis
- spread