I don’t know, but that’s part of what makes this such a good question. I suppose the earlier respondents are correct, at least in part, about “what rage is and where it comes from”, but I’m not so sure that answers your question, does it?
I don’t know if meditation by itself can “cure” rage issues, but “deliberately slowing down one’s response” can. The question is, when the emotion overtakes one, how does one make the conscious decision to delay and think about one’s response? I’d talk to a therapist for awhile just to see how he or she answers your very good “how” question.
I’ve been working on doing this for most of my life, and it may be that age and prioritization is doing naturally what I have had a hard time doing consciously. That is, there are so many things to be fed up with, and so little energy to take them all on.