Clownfish Lifespan

[Bartman]

Howdy,

My Oscellaris clown stopped eating the other day and has begun hiding/lying in rock cracks in low flow areas. I haven't added anything to the tank in over 6 months, water params are all good, there's not a mark on him and all my other fish, which are older, are fine. What is the life expectancy for a clown? I've had him about 2 1/2 years. It may be my imagination but his eyes look a little bugged out. This has been going on for about 2 days now. Any thoughts?

Thanks for the help,
Scott.