old vs aging

old and aging both are nouns.

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

old (noun)	aging (noun)
past times	the organic process of growing older and showing the effects of increasing age
	acquiring desirable qualities by being left undisturbed for some time

old (adjective)	aging (adjective)
of long duration; not new	growing old
(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