One of the mysteries of the English language finally explained.
Especially of middle-aged or elderly people: having qualities associated with young people, especially energy, enthusiasm, or optimism.
Treated as plural. With the: young at heart people as a class.
Mid 19th century; earliest use found in Albion. From young + at heart.
young at heart/ˌjʌŋ ət ˈhɑːt/
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