Does time determine love? opinions please

Ashley

So almost a year ago I broke up with my fiance and we had been together almost 4 years, and about 6 months ago I started dating my current boyfriend and we've already talked about marriage and having kids together, and I feel a stronger connection to him than to anyone I've ever been with/talked with, Is it too early to have these kind of thoughts? we're both young, I'm 18 he's 19. How long should I wait before it's acceptable to get engaged? Pic is us!