I DM a weekly game for adults on Sundays....On Saturdays I DM my son (13), my wife, an adult in the Sunday game and his son (10) and a friend of his (10). We play weekly and all of the kids are very into it. Learning the rules, role playing, etc...
When I was 13-14 I fondly remember playing with my older cousin and some adult friends of his. The games we play with our kids make lasting impressions....take all the advantage of it you can!