second childhood (second childhood)

Idiom Age

意味

the time in old age when a person starts behaving like a child again

老後に人が再び子供のように振る舞い始める時期 (rōgo ni hito ga futatabi kodomo no yō ni furumai hajimeru jiki)

例文

"After retirement, he entered his second childhood."

"退職後、彼は第二の子供時代に突入しました。" (Taishokugo, kare wa **daini no kodomojidai** ni totsunyū shimashita.)