They might balk at putting an 11 year old in an emergency exit seat.
Sitting in the middle row by the bulkhead is where they stick all the infants, so avoid that like the plague.
Sitting at the back means you'll get served last, so the selection of food might not all be there.
HOWEVER, if you order a special meal for yourselves (Vegetarian, Low Calorie, Seafood, Childrens etc...) you'll get served first, while everything is still hot, and you'll be close to the galley for when those drinks just have to get topped up. The screens that keep flashing are a bit further away so you can get some shut eye as well.
Some people think its safer, the airlines don't want to publish those stats for some reason.
Only thing is, you'll be last off the aircraft. Just relax, finish that beer, watch everyone else frantically queuing up as though there is some prize for the first off the aircraft, and casually stroll out once the cheap seats have cleared.