I’m not sure if this was mentioned before (and I apologize if it was) but how about the seminaries teaching that it is not important to get married at 19 or 20?
I know this is going off on a tangent with regard to the age gap- but I think it is much harder for a guy to be a “good guy” than for a girl to be a “good girl”.
Waking for shachris at say 7:00 A.M. 6 days a week and say 8:00 A.M. on Shabbos to follow a yeshiva schedule is much harder than getting up for zman krias shma and going back to sleep until zman tfilla for those taking college courses in the late morning or afternoon.
Putting in a full day of serious learning is much harder than “doing Raizel Reit”.
In my opinion there are many girls who would not be “good guys” had they been an guy, yet they wouldn’t consider anyone who’s not a “good guy”.