dotage vs second childhood

dotage and second childhood both are nouns.

Word	Noun	Adjective	Verb	Adverb
dotage	Yes	No	No	No
second childhood	Yes	No	No	No

As nouns, dotage and second childhood are synonyms defined as:

dotage and second childhood: mental infirmity as a consequence of old age; sometimes shown by foolish infatuations

Other synonyms of dotage include senility.

dotage (noun)	second childhood (noun)
mental infirmity as a consequence of old age; sometimes shown by foolish infatuations	mental infirmity as a consequence of old age; sometimes shown by foolish infatuations