This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Slang An old person, especially an eccentric old man.

n. A male person.

n. An old person, usually a male.

n. A device for boiling water for such domestic uses as heating or washing; a boiler. The normal spelling is water geyser.

n. A queer old fellow; an old chap; sometimes, an old woman.

n. a man who is (usually) old and/or eccentric

"Except when Brokeback Mountain lost: that was the last surge, the last stand of what I call the 'geezer vote'."

adult male    man   

geezery    geeze   

bloke   

gaffer    millipede    untowardness    switcheroo    woman-hater    beldame    curmudgeon    postmaster    charivari    graybeard