second childhood
第二次童年, 老年人在晚年或退休后恢复年轻时的兴趣和行为
日常·描述老年人返老还童
英文释义
To behave in a childlike manner, typically as a result of old age or mental decline
例句
Grandpa has entered his second childhood, playing with toys all day.
典故来源
源自对老年人行为退化的观察，比喻回归童年状态。