Ok, I will be keeping an eye on them. These are the first chickens we've gotten so they are all roughly same age give or take 2-3 weeks. No older hens. They will have free range of our property (7 acres) once they get established in the coop/run.Once they hit puberty, they may not ever get along. You may need to separate them both from the pullets as well, until their hormones settle a bit. Young cockerels can be rough with pullets their first year out. Especially if there's no older hens to put them in their place and teach them control.