Why do people say successful women have a hard time getting married?

I work with a ton of female doctors and lawyers. And trust me when I tell you that VAST MAJORITY of them are married by a certain age. So many of them have rings on their fingers, usually married to men who are equally as educated successful. Where did this notion that a successful woman will always have a hard time finding a man come from?

Why do people say successful women have a hard time getting married?
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