old man

Old man is an informal term for one's father or husband: My old man taught me to fish.

It can address or refer to any man familiarly, often with affection: How you doing, old man?

More literally, it describes an elderly male: a lonely old man on a park bench.

Old man is also a lichen with gray, hair-like strands that hangs from tree branches. (Capitalized Old Man is a character type or sometimes a proper name.)