'01 Sonata: Brakes and Rotors
 

I was getting my tires rotated today (2001 Sonata with 50,000 miles)
and the auto shop told me that my front brake pads have only about 10%
left and needed to be replaced very soon.

They quoted me a price that included replacing the front pads and
rotors. I asked why the rotors had to be replaced and was told that it
is always a good idea to do both at the same time.

As this is my first car, and as I know absolutely nothing about
automobiles, I have a few questions:

(1) Is it normal to replace the front brake pads after 50,000 miles?
(2) Should rotors be replaced with the pads? If not, when should the
rotors be replaced?

Thanks,
Mike