age vs nineties

age and nineties both are nouns.

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

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