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www.reference.com/pets-animals/lifespan-koi-fish-c5869891e3bb1e17

Koi fish have a typical life span ranging from 50 to 70 years. There are authenticated cases, however, in which koi have lived over 200 years. The koi is a decorative variety of the common carp, or Cyprinus carpio, which is bred and kept for ornamental purposes in outdoor ponds and water gardens.

koistory.com/blog/the-koi-lifespan-and-why-japanese-koi-live-longer

Owning koi fish can be a huge commitment, not because they are high maintenance (the only pet that is lower maintenance is a pet rock) but because of how long the koi lifespan is. The average koi breed outside of Japan can be expected to reach fifteen years of age, but the average Japanese koi's lifespan is forty years.

www.koi-blog.com/2009/11/life-span.html

What is the length span of a Koi fishes life? -Time Most Koi live for 20 to 30 years. Some will live longer lives, some will live shorter lives. The two largest factors that will affect their life span are: Genetics; Environment; Usually Koi with good genes and a good blood line will live longer than a Koi that is inbred. Environmental factors ...

pondinformer.com/how-long-do-koi-carp-live

With extremely poor care, koi may not even live to 10 years of age. Even though genetics certainly play a major role in a koi carps lifespan, providing high quality care, nutrition, and pond maintenance is an equal, if not more important aspect, of extending the total life of your fish in garden ponds.

www.myaquariumclub.com/what-is-the-life-of-koi-fishand-how-big-they-grow...

The life span of koi is actually 50 to 70 years but there have been rare occurances of them living up to 200 (I'm skeptical of this one though) A common lenght for koi in ponds is 2 feet, though that's a general size and there have been larger and smaller occurances. My grandmother has five in a very large pond and they're 21 years old right now.

www.fishlore.com/profiles-koi.htm

The great thing about keeping them is that they can and will develop personalities which makes them great pets. This fish lives for a very long time with a life span of 20 years or more if cared for properly. Proper care means providing large enough volumes of water, feeding high quality koi fish foods and keeping the water clean.

www.quora.com/How-long-do-Koi-fish-live-on-average

As Ron Sterbenz said, many people don’t take proper care of their fish, which reduces their life span. I believe that each koi should have 500+ gallons. I’ve read that with optimal conditions (proper habitat, clean water, pond maintenance, and proper nutrition), they live on average 30-35 years, and in extreme cases for up to 100 years.

benskoifarm.com/the-koi-lifespan-and-why-japanese-koi-live-longer

Owning Koi Fish can be a huge commitment, not because they are high maintenance, but because of how long the Koi lifespan is. The average Koi breed outside of Japan can be expected to reach fifteen years of age, but the average Japanese Koi’s lifespan is forty years.

pondinformer.com/how-long-do-goldfish-live

Rotting fish waste and uneaten food also produce ammonia, nitrites and nitrates that can shorten a goldfish’s lifespan. To limit these issues, avoid overfeeding your fish, only feed high quality foods, and invest in a quality filtration system comprising both mechanical and biological components.

pets.thenest.com/average-life-span-goldfish-proper-care-7100.html

Typical Life Span. The average life span of a pet goldfish is five to 10 years. In the wild, they can live as long as 25 years. In fact, the oldest goldfish ever recorded was 43 years old. But prolonging the life of your fish depends on proper care and tank environment. Goldfish require a lot of upkeep. They must be fed a few times a week.