About 6" (inches) They can live for at least 10 years. Some goldfish have lived until their 30's. Their life expectancy all depends on the water conditions they are living in. If their tank is cleaned regularly, there should be no problems.
A one human year old goldfish, is eighteen goldfish years old.
If it is as old as a goldfish that can, it can.
Normally goldfish are peaceful and calm.But incase your goldfish is doing so then its better to separate the new goldfish.
well it just depends how old it is
43 years old
It depends. A feeder goldfish lives to be about 2 years old. A fancy goldfish, (Black Moors, Fantails, etc...) can live to twenty years or more with proper care.
20 years
Goldfish may take 2-3 years to reach sexual maturity.
Feeder fish are different to gold fish. Goldfish can actually live for up to 50 years!
i just got a goldfish from my friend and its a year old ..it looks light brown and big eyed .
anywhere from 20-30 years
Fred