Have you known a bully to change as he or she grew older?

I knew a few bullies in grade and high schools, but once I got to college, I pretty much left everyone from before college behind. I have no idea what happened to any of them.

What I’m wondering is if bullies, when they grow up, recognize what they did in high school or grade school, and if they are contrite or try to change? Or do they stay with the same character all their lives, and continue to treat people in a bullying way?