The two major points of an article in tomorrow's NY Times are (1) only 42% of college students are men; and (2) women get better grades in college than men.
A third point, crucially important to understanding the situation is that "[i]n the highest-income families, men 24 and under attend college as much as, or slightly more than, their sisters."
Despite higher female college attendence, men, on average, earn more money.
This trend is interesting but not really that mysterious:
(1) College is usually seen as preparation for a career, and once upon a time women weren't encouraged to have a career. Today that is not the case and women and men are nearly equally likely to want to have a career.
(2) Women have higher conscientiousness compared to men. Conscientiousness is one of the Big Five personality factors. This causes women to spend more hours studying and to be more likely to obey the rules. Thus they obtain better grades.
(3) At the lower end of the social spectrum, men see skilled blue collar jobs as more financially lucrative than low wage and low prestige white collar jobs available to graduates of bottom tier four year and two year colleges. Indeed, a plumber or an auto mechanic can earn a higher salary than a school teacher. But men from higher social classes have no desire to be a plumber so they are as equally likely to go to college as women.
(4) Men are better at math, and math-oriented majors tend to lead to better paying careers, probably because skills such as engineering and computer programming add more value to the economy, but maybe because such skills are merely scarcer.