I think that once you are adults, it doesn't matter much. There's so much involved in marriage besides physical attraction or "consumating" it. Love and friendship, trust and interests in common ... All those things should factor in before age, and for some people, age doesn't matter!

I read when I was a teenager that, because women live longer than men, women should marry someone 8 years younger than themselves ... but those 3rd-graders didn't really appeal to me! (For the record, Paul and I are within a month of each other agewise (I'm older!).)