youthful

1. ADJ Someone who is youthful behaves as if they are young or younger than they really are. 顯得年輕的

I'm a very youthful 50. 我是個(gè)顯得很年輕的50歲的人。

...youthful enthusiasm and high spirits. …青春的激情和昂揚(yáng)的情緒。