DH is 9 years older than me. I was 18 and he was 27 when we started dating although I had known him since I was 15, (although neither one of us was the slightest bit interested in the other at that stage). It worked well because I was never into the partying scene and was ready to settle down, as was he.
Been together for 7.5 years, married for 5, very monogamous and crazily happy. Expecting bub #1 in January.