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English definition of “second childhood”

second childhood

noun [S]    
a situation in which someone starts to behave like a child, especially because of mental weakness caused by old age: Her grandfather's in his second childhood and talks nonsense most of the time.The elderlyOld or old-fashionedDescribing people who are oldMental and psychiatric disorders
(Definition of second childhood noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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