dotage vs years

dotage and years both are nouns.

Word	Noun	Adjective	Verb	Adverb
dotage	Yes	No	No	No
years	Yes	No	No	No

As nouns, years is a hypernym of dotage; that is, years is a word with a broader meaning than dotage:

dotage: mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
years: a late time of life

Other hypernyms of dotage include age, eld, geezerhood, old age.

dotage (noun)	years (noun)
mental infirmity as a consequence of old age; sometimes shown by foolish infatuations	a late time of life
	a prolonged period of time
	the time during which someone's life continues