be young at heart

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be young at heart

To behave in a way or have a disposition that is more youthful than one's age. Grandma is still so young at heart—I can't believe she's taking dance lessons at 90 years old!
See also: heart, young
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be, stay, etc. young at ˈheart

(of an old person) still feel and behave like a young person: He says that the secret of living to 100 is to remain young at heart.
See also: heart, young
Farlex Partner Idioms Dictionary © Farlex 2017
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