As a college football fanatic and season ticket holder, I'll offer this:
It's a myth that "real" football schools have non-student fans who stand the entire game. I've been to Auburn, Notre Dame, Arizona State, Cal, Iowa State, Wisconsin, Iowa, Northwestern and Ohio State...and never saw non-student fans standing the entire game at any of these places.
I don't think it's too much to ask that non-student fans stand only on third downs and key plays. To me, it's downright rude and inconsiderate not to do so.
Funny, I was watching Oregon last night in one of the great atmospheres in college football, and it might be a big shock, but the majority of their fans SIT when it's not a big play!
This bashing of "old people" is mean-spirited and just plain wrong. I've sat in several sections over the years, and have NEVER had an "old person" yell at me to sit on third down or big plays.
If you want to stand the entire game, do what I've done on occasion: Simply move to the top of either level behind the seats. You can stand all you want. Or, move to the student section.
And no, I'm not old or out of shape. I'm approaching middle-age, and have run several marathons and still run races of various distances fairly often, including this morning.