I see how that would make sense at first, but no there's a difference in the physique of a 32 year old man and a teenager regardless of height and weight. Even a softy like sedin has an extra 12 or so years of weight training and physical conditioning that gives him a big advantage in terms of durability. Also just looking at Nuge without gear on I think it's pretty likely that he's quite a bit smaller than they list him at.
I'm not claiming to be an absolute expert on this topic, so if there's any kinesiolgy majors in here or people who work in the physio industry who think otherwise than feel free to speak up, but through my own experience with sport I've learned that this kind of injury is very common in young athletes who have yet to develop the muscle mass needed to support their shoulders. Remember the shoulder isn't like the hip joint where you have the femur actually firmly attached in to the hip socket, instead the shoulder is a much more shallow connection that requires support to keep it in place. Here's a link to some info about it, the 2nd paragraph down describes it much better than I can;
http://www.yourfunctionalhealth.com/?p=1409
