I don't think you can ever be completely sure. You could live with someone for ten years, and get married and then wonder why the hell you made that mistake. It just depends on the couple. I myself am engaged at age 19. I was 18 when we got engaged, and we had been dating for a year and a half. However, we aren't planning on getting married for another few years. I always get the "you're too young" line, but meh...whatever.
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