1) Adult male 2) Aged oddball 3) Bloke 4) Codger 5) Coot 6) Eccentric fuddy-duddy 7) Eccentric old-timer 8) Eccentric sort 9) Eccentric type 10) Fuddy-duddy 11) Funny old guy 12) Irish slang for a cat 13) Odd chap 14) Old codger 15) Old coot 16) Old guy 17) Old-timer 18) Old-timer, pejoratively 19) Old, crotchety guy 1) Bloke 2) Codger 3) Coot 4) Fogy 5) Old fogy 6) Old goat 
Geezer is a term for a man. It can carry either the connotation of age and eccentricity in the UK, or that of self-education such as craftiness or stylishness (not so much). In the US the term often refers to a cranky old man. Geezer may also refer to: == See also == ...
• (n.) A queer old fellow; an old chap; an old woman.
Gee'zer noun [ Dial. corrupt. of Guiser a mummer.] A queer old fellow; an old chap; an old woman. [ Contemptuous, Slang or Dial.] 
Geezer is slang for a man.
[n] - (informal) a man who is (usually) old and/or eccentric