Hello99: the age gap theory has been widely accepted as reality throughout the Yeshiva world. I have seen myself actual statistics of the remaining girls over 25, obtained from the principals and teachers of the Bais Yaakov across America and they were far higher tan 5% (somewhere between 10-13%). Just ask anyone out there and they will tell you many single girls are scattered all over. In Brooklyn alone there are hundreds of girls in their thirties rotting away alone in rented basements in Brooklyn, without any social network, who have already given up calling shadchanim.
EDITED