a koi can live for hundreds of years if there maintained right. in that period of time they will grow 3 ft.
Ghost carp (Cyprinus carpio) are a cross between the Japanese Koi and the common Mirror carp. They will live for many years (20+) and can grow to immense sizes (1metre+) given choice conditions. In a pond the size you mention they could well live out a long life provided you don't overstock.
Koi that live in a pond can get some food from plant matter, and in the winter can survive in the cold temperatures for a couple of months - they should be fed regularly otherwise
Koi fish can live in almost any country. Koi are thought to be originally from Japan. Many people have outdoor fish ponds in which Koi are the dominant fish.
Koi can live to be about 100 years old
koi need to live in water
In Japan, a koi lived to be over 90 years old.
Carp can live anywhere from 20 to 50 years. Some koi carp have lived for nearly 200 years.
35-45 years
56 years
The Ghost Faced bat lives for about 35-40 years.
they usually live for about 100 years.