youthful

My grandmother has a very youthful spirit and enjoys traveling to new countries alone.

(Chinese) 我祖母有一种非常年轻的心态，喜欢独自去新的国家旅游。

The actress attributed her youthful appearance to a healthy diet and plenty of sleep.

(Chinese) 这位女演员将她年轻的外貌归功于健康的饮食和充足的睡眠。