Well I disagree. This statement about age and settling down is a non-sense. It's strictly subjective and a matter of mental development. Matt is 18 or 19. At this age he's mature enough to leave his parents and live his life on his own, he proved he's able to manage his sexual life according to his desires and from what I see, he has brain and he uses it. He's very bright and I'd say more mature that e.g. Cody, so really... cut it off - there's no age of being mature enough to settle down. Moreover, if he goes steady with Cody, he won't be all that settled down, I bet. It's also a matter of the other partner - Matt can't settle down with one of his peers but I'm sure he can do that with someone older than him.
(It's not particularly an answer to Tim's post, there were more people to say that.)