Aluminum and carbon fiber just don't have a fatigue limit.
[ame="http://en.wikipedia.org/wiki/Fatigue_limit"]Fatigue limit - Wikipedia, the free encyclopedia[/ame]
Repeated forces literally fatigue the material up to a point where a small force (even a bump) can completely break the material.

There was an F1 car racing in an historic racing event when the car broke in half leaving Frederick Kroymans legs exposed.
Ferrari F1 Car Destroyed by Putz in Turn 6 at Laguna Seca (Great Pictures!) - Team Juicy Racing's Skip Barber Racing School and Race Series Forums

Thus aging supercars with aluminum and carbon fiber supercars will almost have and expiration date no matter how well maintained?