young at heart
US /jʌŋ æt hɑːrt/
UK /jʌŋ æt hɑːrt/

1.
berjiwa muda, berhati muda
having a youthful spirit and attitude, regardless of one's actual age
:
•
My grandmother is 80, but she's still young at heart and loves to dance.
Nenek saya berusia 80 tahun, tetapi dia masih berjiwa muda dan suka menari.
•
He's always up for an adventure, truly young at heart.
Dia selalu siap untuk petualangan, benar-benar berjiwa muda.