A Bit About Brakes
It may be hard to believe, but it isn't uncommon for vehicles to need new brake pads and rotors after 40,000 miles. Part of the reason is that braking systems are under a lot of strain in today's cars and SUVs, which are generally heavier, more powerful and faster than earlier models.
However, one should not expect to need to change rotors with every new set of pads. The wear of rotors depends on their design, driving conditions, driving style, pad material and other variables. The best thing you can do, if you aren't doing so already, is to make an effort to drive more smoothly. Accelerating and slowing gradually when possible is often touted as a way to conserve fuel, but it is also a good way to save one's brakes.