decrepitude vs years

decrepitude and years both are nouns.

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

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

decrepitude: The quality or state of being wasted and weakened by or as if by the infirmities of old age.
years: a late time of life

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

decrepitude (noun)	years (noun)
a state of deterioration due to old age or long use	a late time of life
The quality or state of being wasted and weakened by or as if by the infirmities of old age.	a prolonged period of time
	the time during which someone's life continues