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Longman Dictionary of Contemporary English
middle age
noun
EXAMPLES FROM OTHER ENTRIES
▪ The new technique allows women to have children well into middle age.
EXAMPLES FROM CORPUS
▪ In middle age a nation seeks safety and consolidation of material gain.
▪ In middle age he has experienced a breakdown, an identity crisis, which followed a long illness and an operation.
▪ It was a problem of youth, not of approaching middle age.
▪ Life expectancy for all patients is middle age, and heart failure is the leading cause of death.
▪ Memory of life in middle age tends to be sketchier.
▪ She was twenty-three and simply too young to comprehend the feelings of middle age - let alone those of a middle-aged Prince.
▪ The Crown Prince had reached early middle age without marrying.
Douglas Harper's Etymology Dictionary
middle age

"period between youth and old age," late 14c.; middle-aged (adj.) first recorded c.1600.\n

Wiktionary
middle age

n. the period of life between youth and old age; midlife

WordNet
middle age

n. the time of life between youth and old age (e.g., between 40 and 60 years of age)

Wikipedia
Middle age

Middle age is the period of age beyond young adulthood but before the onset of old age. Various attempts have been made to define this age and it can vary between cultures and historic or previous definitions of this stage of life.

Usage examples of "middle age".

Washington Hawkins had scarcely more than entered upon that decade which carries one to the full blossom of manhood which we term the beginning: of middle age, and yet a brief sojourn at the capital of the nation had made him old.

Napier looked good now that he was deeper into middle age-more imposing.