Pads are very dependant on driving style etc.
My 2004 was a used car when I bought it at 14,000 Miles. It was a rental in Hawaii, where I think they don't allow over 45mph so no high speed, but probably a lot of stop and go and fumble foot drivers. I changed my front pads at around 45K and the rotors had a definite ridge. I probably should have had them turned. I would guess I had another 5K miles in the fronts.
The rears were changed at about 50K but probably had another 10K at least.
Just my experience,
Jim Henderson