At this age he wouldn't be a rooster, but rather a cockerel. I'm seeing darker feathers on the wings, which do indicate male specific coloration, I'm hesitant to day male for some reason though @Overo Mare any thoughts?
4 us definitely a pullet and 3 definitely a cockerel. 1 and 2 I'm on the fence I'm seeing male specific coloring but I could be mistaken:caf. Post some close pictures of their wing feathers to make sure