I messed that one up... He joined the Brotherhood after his powers activated so he would have been younger at the time.  James would have left the first time to face the X-Men around 2 years later at 16. While he didn't join the X-Men after that, he simply went back to the Reservation for a short time. After the murder of his tribe he went back to the Brotherhood for the next two years, before finally leaving to join the X-Men and finish school. James would have been 17 going on 18 when he left the Brotherhood for good...<br/><br/>I think that sounds a little better...