old vs aged

old and aged both are nouns.

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

old (noun)	aged (noun)
past times	people who are old collectively

old (adjective)	aged (adjective)
of long duration; not new	(used of tobacco) aging as a preservative process
(used especially of persons) having lived for a relatively long time or attained a specific age	of wines, fruit, cheeses; having reached a desired or final condition; (`aged' pronounced as one syllable)
skilled through long experience	at an advanced stage of erosion (pronounced as one syllable)
(used for emphasis) very familiar	advanced in years; (`aged' is pronounced as two syllables)
excellent	having attained a specific age; (`aged' is pronounced as one syllable)
just preceding something else in time or order
belonging to some prior time