Self Fulfilling Prophecy

I feel as though it will be too likely to happen when your lover is so young(just look at how short average relationships teenagers, and younger than that, last. Is it really so different if one is an adult?).

The social expectation is that relations between children or teens are fickle and ephemeral, and therefore neither ever really makes an effort to survive the first or second storm they go through, and neither do their support systems, even if they are aware and approving of the relationship. If that social expectation were absent, then many more relationships would try, and of course, many more would survive.

I personally know a couple between a slightly older guy (older enough for it to be at least socially questionable, and illegal if they crossed lines, but not older like Heffner either) and a girl. She and her family are very interesting people, but not to ramble on about subjects only tangentially related, their relationship started when she was 13 (give or take circa 1 year, as I am not 100% positive of chronology, but I'm certain it's around that age.) And I don't know either if they met right when she was 13, or a little before, or a lot before, which may be relevant for your analysis. Anyway, a 13yo girl and a guy older enough to go to jail for her, became girlfriend and boyfriend. Well, it's been about 10 years already, and they're still together. They have split several times, and she has dated others in those times (never me, sadly :P) but they always go back to each other. I (and almost everyone who knows them and knows the story) am sure they're gonna marry one day and I am sure that they will be each other's most important life partner in their whole lives. I can't promise they'll never have rough times and maybe even split for a time as they have, and of course, I can't promise that extraordinary changes in exogenous circumstances will not happen which would break them up, but I think they have proven that they are a couple capable of lasting a lifetime. If she can, as a tween / early teen, with a slightly older guy, then any girl can.