N-SING 第二童年;老年昏聩状态 If you say that an old person is in their second childhood, you mean that their mind is becoming weaker and that their behaviour is similar to that of a young child. 第二童年;老年昏聩状态
...his rapid descent into a second childhood.
他迅速恶化至老年昏聩状态
SYN senility, Alzheimer's disease, dotage, caducity