northernhenry wrote:The 12-16 year old won't be sat on their own, usually next to a parent/guardian so need to be mindful of creating an image of a group of children ushering people off a plane.
But does make you wonder: an adult pax sat in these rows (who's been drinking) freaks out in emergency situation, or a very switched on 14 yr old.. 
Personally, I'd go for the adult that has had a few drinks over a minor - in a heartbeat.
Sitting in that row can bring responsibility in an emergency situation. Does a 13 year old with limited life experience know when to make the call to open the door if the cabin crew are incapacitated? Many youngsters are very bright and switched on but we are talking serious situations here for people who may not have experienced any real trauma before. But then I think that exit rows should not be about extra legroom or a revenue generator for the airline.
One of the crew on the FT thread raised a very valid point that the person next to the door is supposed to open the exit, dispose of the door and exit the aircraft first to assist with evacuation. Honestly, in an emergency situation, I would a) worry about a minors ability to cope with that scenario and b) worry that a parent sat in seat A with a child in seat B or C would not be willing to evacuate without their children ahead of them.
IMO, a minor should also never be entrusted with the exit row
in addition to an adult. Those in the exit row should be fully capable of independantly carrying out those actions.