The oldest living goldfish in the world are Koi (singletail) most likely due to the fact that they are (normally) housed in large ponds. Although there are many fancy goldfish that live a long time, Koi surpass them in longevity.
goldie age 44
"The world's oldest captive goldfish lived for a full 43 years. Tish the goldfish, recognised by the Guinness Book of Records as the world's longest living goldfish was won as a prize at a fair. Upon dying peacefully in his bowl in 1999 he was buried in a yoghurt carton at the bottom of his owner's garden. Peter Hand won Tish, along with another goldfish, Tosh, playing roll-a-penny at a fair in Doncaster, South Yorkshire, in 1956. His parents took on the fish after Peter married and left home. Tosh never made it as far, only living until 1975. In 1998 the fish took the world record title from Fred, a Worthing goldfish who died in 1980 aged 41."
There is no record kept of the "oldest Goldfish" but I have known them to live for over 20 years.
43 years old
Fred
A goldfish is a type of fish.
a goldfish.
Paedocyprisis
Goldfish
eggs
Golden
9 pounds 6 ounces caught in Lindo Lake California in 2002