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I think this is one of those questions that the answer is more of an educated guess rather then fact. I would say that in the home aquarium the conditions are the main factor in how long something is going to live. The better maintained a system is the better chance you have of enjoying your fish for a long time. My tank is young in the grand scheme of things only 3 years old but the first fish I ever put in the tank is still with me, again how old was it when I got it? I don't know. Unless you breed a fish, like a clown, and raise the young yourself it is hard to really say how long they are going to live and there again it all depends on how balanced your system is.
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