PCG: uhh you're talking about girls' avg age for getting married is 30's or everyones? I don't know of any career path that requires education past 30, unless people took time off in the middle (in which case they finished their education when they first stopped school but then are returning, so i don't think it counts as "studying till you're 32"). I mean i know some medical residencies are really long, but at that point you ARE working. And PhD candidates or post-docs get paid too.
You know not all men are the conniving sleaze balls that you think, moulding their women to be their servants and philandering in their free time. in fact most are not. And a lot of women are independent thinkers even at earlier ages like early 20s. Also, i kind of like the idea of marriage when you're still under your parent's care instead of living on your own, whether it's a girl or a boy in this situation. You know the person is very innocent and family oriented, which in the end, isn't that what you want? An older guy living on his own is more likely to have been in more relationships some of which might not even be serious. I also think it's less likely the guy will help around the house the older he gets married, but i don't really know how true it is...seems like the younger men would be more receptive to helping out their wife around the house. So there are similar issues whether the guy is old or the girl is old.
I think the main issue is that the older the women (or men) are, the harder it is to find someone b/c all the good ones are taken (and you don't want a divorced one either) and that their beauty wanes too. I scoff at vanity as much as the next person, but when people are older, even the less vain are saddened by their loss of youth. It's like you spent all your prettiest years behind the books and building your career, and when you finally have someone that would appreciate that beauty, you've got the first signs of aging. I of course am assuming that the guy and the girl are both good practicing muslims.