Anyone can tell me the life span of a koi or carp?

Answers:
http://www.carpco.co.uk/faqs.html.

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under good care up to 40 years

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The average life span for Koi is around 25 to 35 years. The maximum life span can be over 200 years in exceptional cases. Koi can reach 18 inches in 3 to 4 years, depending on the pond size, food, and water conditions, the maximum length is about 3 feet.

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koi are very long lived fish, there are records of some in the orient living over way over 100 years

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under ordinary care: 25
good care(extra pond maintanance):30
there are records of koi living well over 40 but this depends on the breed and other factors. carp are simply wild-coloured koi, therefore the life should be the same:)

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In good conditions around 20 to 30 years.