Only 2 years old? great, you don't need to replace them, you only need to have them turned to get the best braking out of your new pads..
you see, the little groves put into your rotor from the old pads (they matched) will just cause the new pads to not clamp down 100% on your slightly used rotors..
check this drawing
on the left is the grooved old rotor (even tiny grooves are still grooves)
on the right is the brand new flat surface of the new brake pad
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now check out this drawing, no grooves = nice smooth surface for the new pads to clamp down onto...and 100% of the pad makes contact instead of 50% or less with a grooved rotor..
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oh you think the pad will quickly conform to the old rotor grooves?? if they do then they are made of a material that won't last more than a couple of thousand miles... seriously, the best thing to do for great stopping power (and safe on road driving) is to either turn your rotors (if they've never been turned before, like in your case) or replace the rotors when you replace the pads if they are to thin to be turned because of being turned 1 or 2 times already.
EDIT:
http://www.google.com/search?hl=en&q=why+turn+my+grooved+rotors+when+replacing+pads%3F&aq=f&oq=&aqi=