Definitions for old-timer
Random House Webster's College Dictionary
a person whose residence, membership, or experience dates from long ago.
an elderly person; oldster.
Origin of old-timer:
veteran, old-timer, oldtimer, old hand, warhorse, old stager, stager(noun)
an experienced person who has been through many battles; someone who has given long service
old-timer, oldtimer, gaffer, old geezer, antique(noun)
an elderly man
One who has been around for a long time or has a great deal of experience; a veteran.