To the best of my knowledge the lifespan of a Khuli Loach (Pangio kuhlii) has not been documented either accurately or otherwise. I had one in a decorative aquarium set up as a community tank many years ago and believed it dead and gone having never seen it after the first couple of months of adding it to the tank. However after about 3 years or so when I eventually had to strip the tank down I found it still very much alive. So I can say from experience that I know that they will live for over 3 years.