I guess you need to be out of your 20’s to answer this one!
A friend and I, both in our 50’s, were talking about this last night. We both thought that, yes, we were both nicer and better people than we were when we were in our 20’s. We got to wondering then if, in fact, most people are because of more life experience/knowledge/wisdom, or if most people become cynical for those very same reasons?