to be young at heart ---- 人老心不老（成语）

英文释义

(IDIOM) To have a youthful, enthusiastic attitude, despite being old

例句

My elderly neighbor is a great-grandmother, but she is to be quite young at heart, and she enjoys travel, lively parties, and conversations with bright young people.

我的老邻居已经是一位曾祖母，但是她人老心不老，喜欢旅游，参加活跃的派对，与聪明的年轻人谈天。