I truely think there has got to be some kind of lean-way around this..... I am having a hard time believing someone would have to take some of the pre-reqs all over just becuase they are 4-5 years old.
I "think" the 5 year rule is to students who took like, 90% of their pre-dental requirements but never applied to any dentals schools, then of course, this makes perfect sence, the material is no longer fresh in thier minds.
However, if someone did take, for-example, general chem I & II and scored nicly on the labs and classes. Came back 4-5 years later and took more pre-dental requirements (like biology, organic chem, biochem, etc) and scored also well on them, I think it takes into consideration that most of this material is still freash.
I have a very very similar issue, I never took any chemistry or biology in my undergrad years, however I did take Physics I & II along with thier labs (2002-2003) and scored B- on phy-I and B+ on phy-II (those are not bad grades for these classes, classes are pretty challenging)..... I highly doubt I'll have to retake physics again.
BTW Im returning to school (hopfully this coming January and starting my pre-dental classes).