Health, Most won’t marry older women. There probably are a few reasons why not -I just mentioned one of them!
Thats between each individual man and Hashem, but IMHO Hashem would be pleased if they did and encouraged others to do the same.
We down here cant produce more guys to fill the need. We have to do our Hishtadlus and not orchestrate older girls having less opportunity to get married, causing heartache to the families of older girls.