They are 4-5 months old. The white one has been crowing like crazy for two or three weeks and the buff has just started, though lacking the fervor of her comrade. I know hens can crow so that's what I'm hoping the situation is, although neither of these is anywhere near the head of the flock. Maybe they're trying. These are feed store purchases and the white one was soooo little I just knew she had to be a hen.