How long do koi fish live?

40 years average; oldest-known koi nearly 230 years old

typically 40 years

Koi have an average lifespan of 40 years, with the oldest-known koi believed to have lived to be nearly 230 years old.

• It is believed that the oldest-known koi lived to be nearly 230 years old.
• The age of the oldest-known koi was determined by testing the fish's scales, which produce growth rings much like a tree.