If medicine is something you really want to do, don't let age stand in your way, just make sure you know what you are getting into. I don't know, sorry. You might want to call the medical schools you are interested in and ask them for an opinion. Again, I don't know. I believe that Johns Hopkins doesn't require an MCAT score, but that's only because the people they accept have extremely high academic standards.
Medical school is seriously hard work.
If you had problems with undergraduate studuying, medical school will bury you. If you have a low GPA because you partied too much during your freshman year, but you have been making it up with stellar grades in your last three years, you certainly haven't put yourself out of the running. Since medical schools receive so many applications, they have to play the numbers game, and if your GPA-MCAT score doesn't make the cutoff, you lose. But, if you get an interview chances are you are on a level playing field with the other applicants. I think my GPA is really hurting me.