You graduated on a Sunday? My school always did graduations on weekdays. I graduated about a week earlier than you did. Juuuust about to turn 40 myself.
And yes, I've either befriended my old bullies (a lot of them were just lashing out because they had a shitty home life/no one to listen to them), or they've gone off to live their lives and I never heard from them again.
My class is finally at the age where they're keeping tabs on who has died since the last reunion, and the list is very short with none of my former bullies on it.