I know its not the point of the thread, but I can't help but totally agree. Sometimes its very very hard to avoid, but fighting in the street with so many variables (hitting head on concrete, jumped by more dudes, weapons, legal issues, etc) is too risky.
To answer your question, I'm 20 and I've never fought a random stranger in the street.
I have fought my friends or kids from school (back in the day- nothing serious) and I do enjoy wrestling my buddies quite often. If you do it right, it can get pretty intense.