I was the recipient of some verbal abuse in my primary (elementary) years since I wasn't the skinniest person around back then. My teachers denied it happening, despite it being quite blatant at times, and they were just as worse putting me down if ever I was to do badly with some work. None of it was ever crushing, but enough to have an effect, obviously nowhere near as bad as some of the stories I'm reading here.
Anyway, if any of them were to sincerely apologise to me now, I'd accept it. It doesn't really make up for it, but I don't need it to, I've moved on. It does show remorse, and I don't believe it's for me to condemn a remorseful person who's being honest and vulnerable. I guess I'd just try to break the cycle of debt keeping with some compassion, and end up feeling a lot better about it. Something unrelated to bullies, but on the topics of apologies long after an incident, happened to me previously, and that's what I did. It wasn't easy, but then again I don't have the burden of a grudge on me right now.