“Remember, there are more girls available than guys available.”
What I think is a more accurate statement is that there are more girls looking for a specific type of boy than there are boys of that type. The proliferation of seminaries and girls who attend them in the last 15-20 years has resulted in girls being told that only X is what you want, only X is a torah life and only X is what a “real” bas yisroel wants. Girls are smart enough to see through the phonies and can tell who is an X and who is an X wannabe. Many who get married when they are 24 or 25 end up marrying those “other types” who they would reject out of hand when they are 19 or 20.