Hi....I just wanted to ask you. You said you took your prereqs between 8-15 years ago...I am currently in an MPH program while also finishing up my 4 pre-reqs remaining (I received a B.A. in Political Science then took a year off) so...to make a long story short. I should be applying for medical school for the acceptance year of 2008 and, if necessary, 2009. That would mean that I took General Physics I (and received an A in it) in the summer of 2000. If I take General Physics II next year and do well in it (I have never received a grade lower than a B on ANY of my pre-reqs), do you recommend that I take General Physics I over? Honestly...I did so well in it, and considering I'm a FT grad student, I don't have the time/money/resources for that. 😕
For the most part, your classes don't actually "expire". It's rare, but there are a few medical schools (around seven, I think) that require all of your premedical pre-reqs to have been completed within a certain time frame upon application. This time frame varies from school to school, so, I'd check directly with the admissions departments of the individual schools that you are thinking about applying to, for their advice.
Most schools, however, will accept your older classes, but prefer to see that you have completed current course work, particularly in the sciences. Since you are working on your masters and also taking your remaining pre-reqs, I think that you would have covered this by the time you apply. If you don't apply to schools with specific time requirements, then you should be perfectly fine. Just make sure you thoroughly review the past material for the MCAT.
My situations was a little different than yours. I had been out of school for something like eight years before I got the itch to become a doctor. Even though I had an excellent retention of the material, I felt that, given my extended time away from having taken any classes of any nature, that I would benefit from retaking the majority of my premedical classes again. This would serve three purposes: to demonstrate my mastery over the standard material required for medical school, to provide current course work over a period of time, and to prepare me for the MCAT. I also supplemented with an additional advanced biology class, a neuroscience class. It was a win-win situation, I think (hope).
So, my sense is that, by-in-large, you will be fine with your current set up. But definitely check with the schools that you intend to apply to make sure.