I'm not sure about drones for 15 year olds, OP.
He might not be mature enough to realise the perils of flying it above local back gardens, especially during the summer and some people may get quite annoyed with him.
At 15, I would be asking him what else he would like for Christmas and buying another option.
Hopefully, other posters who know more about drones will chip in with other perspectives for your consideration.