Well, I'm 34 years old, and am in the process of changing professions. Long story as to why, but after 15 years doing what I'm doing now, I'm just not happy with it. I'm looking to pursue my PhD in a sub-field of physics. I've already started studying and learning on my own in preparation for summer, and thought I would come on here to get some help on any questions I get stuck on prior to starting up in school. Hopefully, I might even be able to help others out occasionally as well .