名詞 second childhood:

1. mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
   同義詞：dotage, senility

1. He's a dear old chap, but0over ninety and in his second childhood. He couldn't tell you the day of the week.
   他是個可愛的老頭。九十高齡，已有些年邁昏庸，他連星期幾也弄不清楚了。
2. He's a dear old chap, but over ninety and in his second childhood.
   他是個可親的老頭，但年齡已九十多了，人也老湖涂了。
3. Be gentle in old age; peevishness is worse in second childhood than in first.
   老來是要和藹; 第二幼年期乖戾暴躁，更有甚于第一期。
4. He's in his second childhood, playing with his grandson's toy trains.
   他返老還童，玩兒他孫子的玩具火車。