I have a Kuhli Loach that is about six years old. Its kind of a miracle its still around. During a water change a couple years ago it jumped out of the tank while I was out of the room dumping the water. I dont know how long it was out of the tank because I thought it was under the gravel at first, but then I found it on the floor behind the tank covered in dust. I got it back in the tank and the dust cleaned off its head as soon as I could.
Guess it doesnt really count because it died a few days ago, but I had a Pristella Tetra that was the last of a group of 5 I bought at about the same time as the above loach. Three of the 5 were alive until about a year ago when one died, then the last two died within the last couple months.