Wiktionary
longtimer
n. One who has been a resident, member, etc. for a long time.
Usage examples of "longtimer".
We discovered that among the families of longtimers, there was frequently a good deal of relief mingled with the resentment.
This male or that one, all of them longtimers on this dreadful, chilly world, had given the herb to her, saying it would improve the way the place looked.
From what the males unlucky enough to be longtimers at the base said, good weather in Siberia was measured in moments each long Tosevite year.
What they tell me, and tell me to tell you, is that the last thing they want to do is draw attention to their existence, and so the next best thing to a longtimer that works for them is a long-timer who goes quietly through life without raising any eyebrows.