While data from the American Community Survey shows that women now lead men in college completion, colleges have actually been graduating more women than men for more than 20 years.
Counting the entire population 25 and older, even women and men who are retired, women are ahead of men in college graduation. That is to say, the average adult woman in the U.S. is more likely to be a college graduate than the average adult man.
There's no real consensus among researchers on why women now lead men in education levels.
Research on this topic has not given us a clear answer as to why women have overtaken men in college attainment. Traditionally, researchers have looked at levels of education as being driven by the resources available, especially from families, and by the rewards of education, particularly earnings and occupational standing. Most research has concluded that the rewards of education for men and women have not shifted over time in a way that explains women’s higher attainment.