A few of my fish are going to be hitting 4 yrs old and that is just how long I have had them. Do fish show signs of aging. I am beginning to wonder in the next few years will I see a few of my fish start to slow and possibly die of old age. I have read that fish can live up to and around 8 years given everything they need is provided. Also, how rare is it that I have never had an ich out break (knock on wood) in the 4 or so years my tank has been up and running. Just curious if anyone else has had great luck in keeping that damn stuff out of their tank.