I have two gorgeous, white EE roos. I had three, but I gave one away to a friend. I had not planned on having ANY roos, but I do, so I'll go with the flow and see how things develop. They are almost 26 weeks old (six and a half months old). I make sure that they are not eating while I'm present - if they do try to eat, I drive them away from the feed. They can eat when I'm gone. I also do not let them mount or display to the hens while I'm around. If they start that, I interrupt their fun. I'm hoping that the thing's I've read that instruct me to do these things really do work....if not, my neighbors are being entertained by all my shenanigans twice a day! I will probably just keep one of the boys....so I'm trying to evaluate the keeper based on behavior. At what age does aggression develop? I'm not seeing any aggression towards me. The give me a wide berth, but not a panic-berth where they are terrified of me. They just move away as I walk around.