I've many post as to when does the cockerel crow. I have two from the same hatch from same the daddy. Both are right at 14 months .Hatched Dec 21st. Both know their function, at least try to show they do, but one has been crowing a week and the other one has not made a sound. So I would say it is just the individual bird and not an age thing. Now the one crowing does sound like he has a terrible case of laryngitis, but I know he calls it crowing.