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Middle age (or middle adulthood) is the age range of the years halfway between childhood and old age.[1] The exact range is subject to public debate, but the term is commonly used to denote the age range from around 40 to around 65 years.[2][3][4][5] Many changes may occur between young adulthood and this stage.[6][7][8]
Oxford Dicionary
was invoked but never defined (see the help page).Merriam Webster
was invoked but never defined (see the help page).When is middle age? We define middle age as "the period of human life between youth and old age, sometimes considered as the years between 45 and 65 or thereabout."Given the different views on when old age begins, it shouldn't surprise you to learn that the exact range of middle age is not set in stone either. In general, our age range of "45 to 65" is around the age range generally used to say when middle age supposedly occurs. Polling shows that people may think middle age begins later or earlier depending on who you ask.