Not all students set out for college immediately after high school graduation. Some enlist in the military, spend time in the workforce or take time off to travel the world. For those who choose to go to college later in life, having classmates who reflect their age, interests and experiences can help ease the transition from the "real world" to the world of an undergraduate student. Of the colleges and universities that are part of the current U.S. News Best Colleges rankings – which all enroll at least some first-year, full-time students – the schools on this list had the highest percentage of undergraduate students age 25 and older in the 2019-2020 academic year.