While I can’t do much to help you with the math calculations (math was never my strongest subject 🙂 I think that there is another important point to be considered:
When a frum girl reaches her mid to late 20’s she is no longer redt to guys who are within her age group. Instead, she is redt to guys who are in their mid to late 30’s. From what I have seen, guys who were never married at that age usually are not typical. I know this sounds mean, but I think it is true in many cases.
It is possible that you will find a single guy that age who is totally normal, but I think those are few and far between. On the other hand, girls who are in their mid to late 20’s have a greater ability to remain status-quo and will not go for a guy like I have described above.
These are just my personal thoughts on the matter. If you think I am way off the mark, let me know.