age-old vs antique

age-old is not a noun while antique is a noun.

Word	Noun	Adjective	Verb	Adverb
age-old	No	Yes	No	No
antique	Yes	Yes	Yes	No

As adjectives, age-old and antique are synonyms defined as:

age-old (noun)	antique (noun)
	any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity
	an elderly man

age-old (adjective)	antique (adjective)
belonging to or lasting from times long ago	made in or typical of earlier times and valued for its age
	out of fashion
	belonging to or lasting from times long ago

age-old (verb)	antique (verb)
	give an antique appearance to
	shop for antiques