Let me get this straight, the girls put themselves on the list of who they consider to be “top boys”, they don’t go on dates because they are now on this list and waiting, and they blame the boys.
Both the boys and the girls are equally selective and equally at fault. There are plenty of guys without lists and without dates as well.
The age gap is not an issue. Stop trying to artificially create a mirage of a problem, for the sake of becoming the savior with the solution. Let people go out when they are ready (regardless of age) and to whom they feel will be a good match for them.
If you really want to help the situation, encourage more people to become part time shadchanim. Educate them as to how to do it properly (not just, he is a guy and you are a girl, so go out).
Also, please cut this trash about an island. Your theory begins with the fact that all are cut from the same cloth, following the same patterns in their life. The reality could not be further from the truth.