Last year, at graduation, our youngest graduate was an early entrant and our oldest was 62. Not that I was paying attention. This illustrates a key point about both Shimer and higher education more broadly: the 18-25 year old "traditional" student is not the only type of student out there. Nor is the "new normal" of students over 25 the sole set of non-traditional learners who engage with college. Yes, there are early entrants.
For a discussion of this theme, see this piece, by yours truly, in the Huffington Post. And, comment away there -- it helps boost Shimer's visiblity. Were you an early entrant? Tell the world about it on the Huffington Post.