I can totally understand where you are coming from, but in my opinion, a Christian marriage should be more about what a man gives than what he gets.The funnier part isn't about what "marriages last" as if all marriages these days aren't questionable. The real issue about the gap is "Does a man get anything, yes anything at all, out of marriage these days?" I fail to see why a man wouldn't at least try to get youth from the girl, given that nothing else either comes commonly, or can be enforced (unlike his funds and earnings).
Yes, the raw material does matter but you can only do your part to be faithful to God. What a woman does will of course depend upon your example, but a good marriage is about much more than finding the "least bad option".
In truth, it is about both parties giving 100%, and expecting nothing in return. Only then can you fulfill God's plan for marriage.