Koi lifespan and age in human years
Average lifespan about 40 years
Koi live about 40 years on average. Below is a chart converting Koi age into human years, plus a calculator.
How old in human years?
Age
Koi age chart in human years
Shaded rows are equivalent to human age 60+.
| Koi | Human age | Stage |
|---|---|---|
| 5 yr | 22 | Adult |
| 10 yr | 30 | Adult |
| 15 yr | 39 | Adult |
| 20 yr | 48 | Middle age |
| 25 yr | 57 | Middle age |
| 30 yr | 66 | Senior |
| 35 yr | 75 | Elderly |
| 40 yr | 84 | Elderly |
| 45 yr | 93 | Elderly |
| 50 yr | 102 | Elderly |
| 55 yr | 111 | Elderly |
| 60 yr | 120 | Elderly |
Sources
How we convert ages: method.
More Fish & water life
GoldfishLifespan about 12 years
Japanese rice fish (medaka)Lifespan about 2.5 years
GuppyLifespan about 18 months
Siamese fighting fishLifespan about 3.5 years
Neon tetraLifespan about 5 years
Freshwater angelfishLifespan about 12 years
Pond loachLifespan up to 7 years (record)
ClownfishLifespan up to 20 years (record)
Red swamp crayfishLifespan about 4 years
Striped mulletLifespan up to 16 years (record)
AyuLifespan up to 3 years (record)
Pacific sauryLifespan up to 2 years (record)