aged vs old

aged and old both are nouns.

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

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

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