People still stand up in the clubs, which bothers me, since I'm in the last row I have to stand then. But it's part of being at the stadium. From the renderings, it looks like the new stadium will be steeper, so maybe if the person in front of you stands, you may still be able to see.
I asked a few years ago, what the average was, and at that time it was 15 years. I think I was at 20-22 years at that point.
Most of mine go to family and friends. Last season only 3 games ended up on the secondary market.