old vs white-haired

old is a noun but white-haired is not a noun.

Word	Noun	Adjective	Verb	Adverb
old	Yes	Yes	No	No
white-haired	No	Yes	No	No

old (noun)	white-haired (noun)
past times

old (adjective)	white-haired (adjective)
of long duration; not new	favorite
(used especially of persons) having lived for a relatively long time or attained a specific age	showing characteristics of age, especially having grey or white hair
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time