To have that fish for two years in that set-up would be considered success in my book. Let's say that the fish CAN live for 5 years or more and people CAN live well over 100 years but only a few of us ever see triple digits. We succumb to ailments and organ failures and I would assume the same happens to fish. I don't know the "fish" years ratio as I do the "dog" years ratio to "people" years but I would guess that a fish, of unknown age, that has spent two years in your care would be a senior citizen. And to sum it up, I would say that your fish has the potential to live a few more years, per life-span, but it would not be a surprise if the fish died soon due to natural causes just as it wouldn't be a surprise for a human to pass by similar means at the age of 70.
That's about as much as I can do for life expectancy but I would encourage you to look at what you can control which is water quality. According to your signature, there are only 2 clowns with your scooter. If so, the scooter may show signs of stress before the clowns do.
1. Have you recently tested your water and what were the parameters (and with which test kit)?
2. Are there any new fish, corals or other inverts recently added?
3. Any other recent changes to your tank... water changes, filter changes (aquarium and/or RO filters), additives, foods, equipment?
4. Have you checked for temperature fluctuations?
Hope things turn around for you and your Scooter. Good Luck!
Mike
