Hello, I am middle aged and came here for advice from more experienced people in the field of Physics. I need to get a good foundation. I do have an opportunity to go to school, essentially, for as long as I want. Some of the fields I am interested have upper level physics requirements. At one point I did entertain the idea of wanting a PhD in physics, but after reading a couple articles by some of the people I look up to, it seems as if those jobs are limited to military or professor. Thank you for reading.