No you are not too old.
All those fields are science-heavy. I think the first thing you should do is go enroll in a science class or two at one of your local 4-year universities. I would start with general biology (take the biology course that science majors take, not some other nonscience major course). I recommend talking to the health professions advisor at the university where you enroll, if there is one. If they send many students at all to pharm and DO and PA and nursing school, they should have such an advisor and/or advising office. Community college would be OK for some programs, but you'd better check with some schools before you go the community college route (i.e. check with a couple of nearby pharmacy schools, a DO school, a PA school, etc.).
Timewise, realize that the DO thing takes a lot longer. You are talking about at least a couple of years of getting ready and trying to get in, then 4 years med school and 3 years residency at minimum. Residency is kind of like being in school + working at the same time, because you have to study a lot, the hours are terrible but you do get paid.
If you do PA school, it's just the school and then you are done. Some people elect to do a short residency but I think it's just 6 months at most.
Pharm. school is 4 years from what I know, but once you are done you can go straight out and get a good paying job (i.e. a lot more than what a medical resident gets). I have heard that competition for pharm. school is becoming fierce. You'll need a good science background to get in, with good grades.
