That's a sign of great care by you! IMO, like pretty much all catfish, they'll live a LONG time given reasonable care. I'd be curious to see who's beat 10yrs!
10 years maybe a little high, I had Cory Robinae that lived for about 7+ years before they all "passed away" one at a time, and then replaced with just simple Pepper cats now. But they too are now passing the 5year mark.