My cockerels are 14 weeks, still not mean. I am not keeping the breed because I only have so many breeding pens and had a large cockerel to pullet ratio with mine, so sold the pullets and am waiting for the boys to get a bit bigger before I take them to the swap. It may be that they are the youngest and smallest in my rooster coop that keeps them calm.That's to bad I'm getting ten chicks tomorrow