geezer

Short definition from Wiktionary

Noun

1. 1
   A male person.
2. 2
   Someone affable but morally dubious; a wide boy.
3. 3
   Term of address for a male.
4. 4
   An old person, usually a male, typically a cranky old man.
5. 5
   Wife; old woman.
6. 6
   Alternative form of geyser (“domestic water boiler”).