worn vs old

worn is not a noun while old is a noun.

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

worn (noun)	old (noun)
	past times

worn (adjective)	old (adjective)
affected by wear; damaged by long use	of long duration; not new
showing the wearing effects of overwork or care or suffering	(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