Rob Bernhard , Feb 23, 2007; 04:04 p.m.
I had sensor dust on my Canon A80. Then I accidentally dropped my camera (causing some body damage) and the dust went away.
I wouldn't recommend this as a solution (even though my A80 continued to work fine) but dust on the sensor of a point and shoot is not unheard of. You could, at your own risk, try tapping the camera to see if the dust comes loose but aside from taking the thing apart there's not a lot to be done.
I don't think your camera is "worn out."