Question on squeling brakes

Do not where to post this so here I go, I have a 2003 Cady CTS that the brakes are squeling on, the car only has 39,458 miles on it. Usually brakes only squeal when the pads are worn badly, I have not pulled the wheels off yet due to the low mileage. The rotors look right and no lip on the outer edge. My truck has 90,000 miles and have just replaced the pads, that is what is puzzeling me-should a gently driven cady need new pads at this low amount miles. There is no rust on the rotors as the auto is garage kept since new. Any help is greatly appreciated