Platy - age when they show sex differences?

[lifefish]

Can someone tell me at what age Platies show their sex? I have a number of comet platy babies who are almost 3 months old, and ar about 1.5 inches long. they all still look like they are female?

Any help would be appreciated.

[Eileen]

I read in another forum about 3-4 months. Platys take longer. You sometimes have fast maturing males and slow maturing males that take on a larger body like a female and develop later.