oldtimer vs old stager

oldtimer and old stager both are nouns.

Word	Noun	Adjective	Verb	Adverb
oldtimer	Yes	No	No	No
old stager	Yes	No	No	No

As nouns, oldtimer and old stager are synonyms defined as:

oldtimer and old stager: an experienced person who has been through many battles; someone who has given long service

Other synonyms of oldtimer include old-timer, old hand, stager, veteran, warhorse.

oldtimer (noun)	old stager (noun)
an elderly man	an experienced person who has been through many battles; someone who has given long service
an experienced person who has been through many battles; someone who has given long service