nineties vs age

nineties and age both are nouns.

Word	Noun	Adjective	Verb	Adverb
nineties	Yes	No	No	No
age	Yes	No	Yes	No

nineties (noun)	age (noun)
the time of life between 90 and 100	how long something has existed
the decade from 1990 to 1999	a time of life (usually defined in years) at which some particular qualification or power arises
the decade from 1890 to 1899	a late time of life
	an era of history having some distinctive feature
	a prolonged period of time