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

1.
心態年輕, 心境年輕
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.
我奶奶80歲了,但她仍然心態年輕,喜歡跳舞。
•
He's always up for an adventure, truly young at heart.
他總是樂於冒險,真是心態年輕。