Ooh yeah.. but I've never ever caused trouble, started a fight or looked for one. School ground, street, sports arena or work place.
I am lucky enough to report mostly I have been a winner, including by knockout, with a few draws, but I've never been bettered; and certainly not because I'm the toughest guy going around, I just haven't ever encountered an idiot that's ever had a go at me of any genuine ability or toughness. Guys who are genuinely tough don't need to go around causing trouble or proving anything.
I got attacked once by three guys, one of whom had a pool cue. They came second.
The older you get, the more circumspect and wary you are and probably need to be around that sort of stuff. It can get you seriously hurt or worse.