Currently, all my fish were purchased this spring,
or last spring/summer, as 'feeder goldfish' at Petsmart.
They sell for around $.29 fish about 1 1/4" to 2" long.
They sell for around $.14 fish about 3/4" to 1 1/4" long.
(I do not very often buy the latter - higher mortality rates!)

About how old do you figure fish of those 2 groups are?

Separate question, about what water temperature
do the 'breeders' use for raising them?
(or what is economicly / mortality wise, the ideal?)