Beware that formal post bac programs are pricey.
My prereqs were about 10 years old when I started the process. I had gotten C's in organic chem so I retook those at a local state college for pretty cheap. Took a MCAT review course, too. I didn't get accepted my first time, and the school that I ultimately went to suggested I take extra upper level undergrad courses (such as biochem, genetics, immunology) I did that..2 courses per semester at a local school, including that summer, while I continued to work. My second time applying, I got in and started med school at 38.
Now that I'm facing a mountain of debt, I'm glad I didn't go to an expensive postbac program. Even though at the time I was a bit disappointed to have to go to my state school than to a bigger name place, ultimately I have found the clinical experience for med students to be better at places without the big name. I'm currently a surgery resident at a bigger name program, private med school, and the students here are spoiled, coddled and have an entitlement mentality. Plus the expectations of them in the clincial rotations are pathetically minimal (at least compared to what was expected of me in med school)