I don't think it is that unusual to get such mileage from the original brakes.

F-body rotors are another issue, though...
My 00 has close to 55K and neither the front nor the rear brakes have been opened yet.
Fronts are just now getting to their last 10% and the rotors are warped, so it's about time to open them soon. Rears still have plenty of meat left, so I don't have to touch them in another 10K+ miles.
My 99 Firebird had just about 50K when I did the fronts on it.
TS