You know, there were times in our history when the chachamim made takanos regarding exactly who could marry whom. It will take that kind of absolute authority for age-restricting to happen. Otherwise, mandating age as the primary criterion will NOT lead to our kids building batei ne’eman b’Yisrael. That is what we have to focus on. Of course they won’t have a happy home unless it’s centered on Torah but we have to stress to our kids that once they get married, every action in life is to geared to will this build our bayis ne’eman.
I’m skeptical about the age thing. Let the boys go out with girls near their age for the first few, but after that, whoever is doing the setting up has to focus on one thing: will these two people be good for each other.