I don't know when they will be old enough to tell the difference between male and female, but this is what I found on a fish website that I have been looking at for information: "The female has orange scales on her lower body and dorsal fins and the male is larger, less colorful, has a steeper forehead and longer fins. As it ages, the male will acquire a fatty lump on the forehead." I hope this helps. 
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55 gal~4 black skirts, 1 glass fish, 1 platie, 2 black mollies, 3 like fish I don't know the name of....
10 gal~2 basic goldfish (my daughter's tank)
5 gal hex~ 5 neons, one male betta
2 gal hex~ 2 crab (my son's tank) |