The share of college students who are adults—defined as 25 years of age or older—is now about 40 percent. But most colleges haven’t adapted. For instance, they still schedule the majority of classes around midday, which is convenient for late-night-partying undergrads, rather than at night and on weekends, when grownups with jobs and families can actually attend them.

A few schools are working to fix this scenario.

A report from the ACT Center for Equity in Learning finds that working more than 15 hours per week can be detrimental to the academic success of college students. 

The students who work more than 15 hours per week also tend to be from underserved backgrounds, the report says, and consequently are less academically prepared than their peers. So, obstacles posed by busy work schedules can further set back students already behind.