Mine is a blue chromis purchased around 97-98 for my first SW tank which was a 55. I was young, went through my first tank crash, and he was the first fish I bought after the crash. Little bugger has survived 3 tank moves, a scarey all out attack from a huma, and is living the high life now in our 180 (a little scarred, but huma free and happy).
I had a sailfin purchased a few months after the chromis but we lost him this past September. Had a rock slide while we were on vacation which killed another fish. Our fish-sitters didn't notice the fish missing so it stayed there for a week which killed the water quality and subsequently the sailfin.
Its amazing how long these fish live if you just take the time to learn and take care of them properly.