According to the U.S. Census report of 2012 there were 102 Million unmarried people over the age of 18. Women made up 53% and men 47%.
I'm sure some of those numbers are skewed somewhat as women tend to outlive men. In fact the older a man is the more options he has with women of his own age group.
Some women like are happy being single!
Better career opportunities, higher incomes, better birth control methods, and the doing away of stigmas with regard to cohabitating and pre-marital sex has given today's women far more options than women in past eras.
During the early 1900s most women's goal was to finish high school, find a man to marry and raise a family. Oftentimes those women who went to college were in hopes of finding a man who was going places or came from a "well to do" family. Home economic courses stressed the duties of wives and mothers. Some of the stuff that was deemed acceptable back then is seen as sexist and archaic today.
Another group of women simply don't like men and don't trust them. This keeps them from completely opening up their heart. They're always on guard for any sign of mistreatment. Such people are always of the mindset of "You & Me" and not "Us & We". They're ready to breakup in a heartbeat. They're afraid of losing themselves in relationships. Lots of women HATE the whole dating process.
Your subconscious mind will never allow you to succeed at anything you despise!
Oftentimes both men and women (limit) their options. Everyone is entitled to have their own "preferences". However the more "must haves" a person has the more difficult it will be for them to find love. For example one says their mate has to be of a particular race depending on what that is they could be eliminating 6 billion people sight unseen!
Some people without knowing it are "aiming out of their league". Society has stressed so much to women (not to settle) that they often overlook men who are butchers, store clerks, mail men, mechanics, truck drivers, and so on. Although the woman herself is financially independent she still wants a man who earns as much as she does or preferably more! Anything less would be considered "settling". Traits such as loving, loyal, considerate, faithful, and trustworthy take a backseat to good looks, money, and excitement.
Many women have given up on men after bad experiences. The problem was with (their selection) criteria.