This reminds me of a gig i went to a few weeks ago...your typical emo band, who i really like and have done for about 3 years.
There were about 1000 people at this gig and about 3/4 were sitting at the back of the arena or just standing still while a very very small crowd in the middle were moshing they're little hearts out, including me!
I'm 21 and can easily say i was older than almost everyone there, but when i goto gigs i damm well jump around and have a good time.
These are the bands these kids adore, as you can tell by endless myspace pics/rants etc etc, so why the heck when they goto see them do they just stand around???
Bring back the punk era i say!