I think whether the marriage is successful or not will depend primarily on each other's view of marriage, not your age. If you both take those vows and stick to them, view marriage as a permanent bond, and view each other as the only person of the opposite sex that you want and treat them like that, I think you'll have a happy marriage. It's about love and respect. If either goes away and your eye starts wandering outside of the marraige bond, then its just the beginning of the end.
But I really dont have any place to talk on the matter. I support the marraige arrangement and I respect it. Age doesnt matter. You're attitude and how you treat your mate does.