Old-timer

a person whose residence, membership, or experience began long ago and has been continuing for a considerable length of time; veteran.

an old person.

an old-fashioned person or thing.

Sometimes Offensive . (used as a form of familiar direct address to an elderly man.)

noun

fossil * , geezer , golden-ager , gramps , mossback , old dog , old hand , old soldier , senior , veteran , war-horse , ancient , elder , golden ager , senior citizen