The author of this article at the Washington Post makes a huge mystery out of a question that's pretty easy to answer:
According to the Census Bureau, fully one-third of young men ages 22 to 34 are still living at home with their parents -- a roughly 100 percent increase in the past 20 years. No such change has occurred with regard to young women. Why?
The obvious reason why young men are living at home is because the cost of housing has been increasing faster than starting salaries. More and more young men can't afford to live on their own.
The salaries of young women have been increasing relative to men. Here's an article I found on the web which has a chart showing the steady increase of women's wages, and this increase is probably even more pronounced for younger women. So while the cost of housing has increased relative to young men's salaries, it may not have increased relative to young women's salaries, or at the very least it has increased at a much slower rate.
Huge mystery solved! Too bad the bar for getting an article published in the Washington Post is so low.
Read my followup post, Median income for young men is declining. Also read my comment, below, which further explains my point.