Bob,
It is never too late to go back to school, although it seems tougher when you have family obligations. Put your vacations on hold. Plan on studying every night. Remember a lot of science classes have labs, so you might want to take it easy on the course load. I went back for my M.S. at age 44. It took me 4 years doing it part time while working 40 hours a week. I usually took 2 classes (with their associated labs). Persevere and you'll make through. That sense of accomplishment is worth it and when your done you have a marketable skill and extra cash for new gear. Good luck.
Ray