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A few years ago, I know the longest lived goldfish on record was 47 years old.
Goldfish can indeed live for decades if they are cared for properly. Because of their size and bioload, a fishbowl will not sustain them for long. They will die to ammonia poisoning released by themselves.
I do not recommend goldfish as a beginner fish either. Some small sized tropical fish are much easier. You will still need a filter system, and now a heater too if you indeed go tropical.
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