From Longman Dictionary of Contemporary Englishhoaryhoar‧y /ˈhɔːri/ adjective 1 OLD/NOT YOUNG[usually before noun] a hoary joke, remark etc is so well known that people no longer find it amusing or interesting Not that hoary old chestnut (=old idea, joke, remark etc) again.2 DCB old-fashioned grey or white in colour, especially through age
Examples from the Corpus
hoary• a hoary 1940s musical• For a female swimmer, 29-year-old Angel Martino is downright hoary.• Then bring her back inside, complete with Groucho Marx cigar, to run through a repertoire of hoary Borscht-belt gags.• Attractive hoary foliage, and brilliant scarlet orange flowers.• At least one House Republican freshman maintains a hoary political tradition by staging town meetings with his constituents.• All the grass in front was brittle and hoary white.• It contains many majestic old oaks and hoary willows.Origin hoary (1500-1600) hoar; → HOARFROST 