<p>I'm a master's student. Last semester I took a doctoral level statistics course, and there were several students in the class who were in their forties and fifties.</p>
<p>I've heard of a guy who, at age 70, went back to school to get a master's degree in theology. I don't know if he planned to use it professionally; perhaps he was just passionate about the subject - which is reason enough to pursue a degree, if you have the resources.</p>