You should know within the next two months. Hens have barred tailfeathers which they regrow with their first adult molt; they also have white or irridescent round marks on the inside of their flight feathers. The cocks will lose their barred tail feathers and never regrow them. Cocks also will start singing for hens and making heartwings right around ten to twelve weeks old. Some start sooner, others later. Both hens and cocks are cuddly if you work at keeping them hand tame; so there really is not that much difference in their behavior once mature.