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Discover Ludwig"young at heart" is correct and usable in written English.
You can use it to describe someone with an optimistic outlook on life and a youthful attitude, even if that person is not actually young in age. For example, "My grandmother may be in her 70s, but she's still young at heart."
Dictionary
young at heart
adjective
Inclined to act in a way or enjoy things that one would expect from someone younger, especially children, teenagers or young adults.
Exact(52)
There is no mistaking the origin of YOUNG AT HEART.
LOL I'm like 45. Vita: Young at heart, girl, young at heart.
"He's young at heart.
"But I still feel young at heart".
But she's just very young at heart".
She was young at heart and young of mind.
Similar(7)
Well, at least to young-at-heart Californians.
Surely the city's young and young-at-heart must be learning something.
Become an instructor for other young-at-heart people if you get really enthused.
Ludo's parents alternately humor and berate him; his young-at-heart grandmother comforts him.
PROJECTED SALES: Several thousand MARKET: For the young and young at heart with lots of cash.
More suggestions(4)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com