|2.||Young At Heart|
Adjective: A fun personality.
Dude A: My buddy makes cartoons for a living.
Dude B: Yeah?
Dude A: Yup, he has two kids, but he's still young at heart.
|1.||Young at heart|
This phrase is different then child like. Young at heart is like still playful still likes to do fun stuff and not have a care in the world. Childlike is just annoying.
She is young at heart.