I don't think it effects the MCAT, but some schools prefer you to have taken the prereqs within a certain amount of time. Check with individual schools.
Preparing for the MCAT gets a bit harder the longer its been since you've taken the prereqs, unless you are working in science or taking upper level things. People forget things, and the bulk of the other people taking the test have just finished the prereqs, so if you are going to take the MCAT many years later, plan on spending significantly more time "reminding" yourself about the basics, and ideally take a test prep course. Also note that there are many schools that will want to see the grades from recent science course work to be sure you can still hack being in a science class, so if you have truly not taken sciences for 10+ years, you may want to take a postbac or some upper level classes in any event.
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