SErious now, truth is I had gold fish, for over 2 years, some know they live and had a friend who had gold fish over 5 years, they do grow, chubby also. The hook line and sinker of the water thing is this. I always used spring water for the tank. The filter stays pretty much clean for a month. Even at times over a month. once ran out of it, and used tap water straight without any filters. One week later the fish tank filter was filty dirty, and the fish developed a black mass on it's neck. It didn't live long after that.
We are made of 70 to 80 percent of water all the way to the shoulders in a diagram, depending on the weight. Babies even more.
Ty for the info.