Hi all, I searched around for a place to ask this, and this forum seemed especially appropriate. It's my first time posting though, so my apologies if this is out of place. I'm about to turn 27, and five years ago, I earned a BS in math. I was a very good student, both generally and in math, although I did not do much research outside my coursework. My question is how easy is it to go back to school? I'm feeling an ever-growing itch to get back into mathematics. The problem is I have a comfortably-paying job (related to math education) and my own apartment now. I'm worried about going back to a college lifestyle. However, I truly have no interest in working full-time and just taking classes in the evenings. My itch is to do research and actively pursue a PhD. Can anyone provide insight here; how easy is it to go back? Will the material come back to me easily? Am I starting to become too old to pursue a degree full-time? Is it okay if my letters of recommendation come from employers, not professors? Is the transition back to a cramped apartment with a roommate manageable, or put simply, will I feel old? Sorry for all the questions! Any help is appreciated!