second childhood

剑桥词典

a situation in which someone starts to behave like a child , especially because of mental weakness caused by old age
（尤因年老智力衰退造成的）第二童年期
Her grandfather's in his second childhood and talks nonsense most of the time . 她祖父年老昏聵，大多數時候縂是不知所雲。 返回 second childhood