greybeard

• graybeard

From grey +‎ beard; men of advanced age would be expected to have a grey beard.

greybeard (plural greybeards)

1. (poetic) An old man.

   Synonyms: see Thesaurus:old man

2. (figurative) Any of the members of a group who have been there the longest, often implying experience.

   Synonyms: longbeard, oldbie, old-timer, veteran

   Hyponym: greymuzzle

3. (historical) A coarse earthenware vessel for holding liquor; a bellarmine.

   Synonym: longbeard

4. A powerful wave in the vicinity of Cape Horn.