I have two light brahmas, both are supposed to be about 15 weeks old. I think the one pictured above is a rooster, but I'm not positive. I haven't heard any crowing as of yet. I also have a silkie rooster, age unknown, that is crowing.
This is the other. It's smaller and has a lighter comb. I'm pretty sure this one is a hen. This is my first time owning chickens.