Etymology
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geezer (n.)

derisive word for an old man, 1885, according to OED a variant of obsolete Cockney guiser "mummer, one wearing a mask or costume as part of a performance" (late 15c.; see guise). If so, the original notion was "one who went about in disguise," hence "odd man," hence "old man" (it still commonly is qualified by old).

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Definitions of geezer

geezer (n.)
a man who is (usually) old and/or eccentric;
From wordnet.princeton.edu