Take a look at the two photos in this article about the out-of-control protests in Quebec over the rising cost of tuition.  Looks to me like these, um, students have aged rapidly under the pressure of studying.

Richard Baehr adds: If you spend time in Europe, you meet a class of lifelong students who never hold jobs.  It has come to the Americas.

Ed Lasky comments:  I will say that my school had some pretty old grad students...they just like campus life. Who wouldn't, especially if someone else pays?

Thomas Lifson confesses: I didn't finish grad school until I was 30, but some of these geezers have white hair and receding hairlines.