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My nana’s goldfish in her pond are 20+ yrs old
I just recently lost one at almost 10, and that was premature. They will definitely live to 20 or older with good care, and never totally stop growing.
why is the captive lifespan like half of the wild
It’s not really. No clue where the source fluff piece got that. If anything, you would think it might go the other way with steady access to food, protection from predators, etc.