Probably 17, when I got my license and a car (in NJ the driving age is 17), if only for the practical reason that before that, I would have had to been picked up from anywhere (it's absolutely impossible to walk anywhere in my hometown and I was the first of my friends to turn 17). I never had a curfew, per se. I definitely stayed out until 3 or 4 in the morning regularly by my senior year in high school, but mostly doing things like sitting and drinking coffee at Denny's or hanging out at my (gay) guy friend's house. Occasionally at my boyfriend's.
How old were you when you attended your first wedding?