Etymology
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graybeard (n.)

also greybeard, "old man," 1570s, from gray (adj.) + beard (n.). Middle English had gray-hair (n.) "old man" (late 15c.), and simple gray in this sense is from late 14c.

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Definitions of graybeard

graybeard (n.)
a man who is very old;
Synonyms: old man / greybeard / Methuselah
From wordnet.princeton.edu