old vs overage

old and overage both are nouns.

Word	Noun	Adjective	Verb	Adverb
old	Yes	Yes	No	No
overage	Yes	Yes	No	No

old (noun)	overage (noun)
past times	a surplus or excess of money or merchandise that is actually on hand and that exceeds expectations

old (adjective)	overage (adjective)
of long duration; not new	too old to be useful
(used especially of persons) having lived for a relatively long time or attained a specific age
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time