I've had my Pentax istD for just over 3 years now. I've taken many thousands of photos with it, all over the world, and am now beginning to notice signs of it aging... the Menu button is quite temperamental and doesn't work every time, the flash no longer pops up and needs pulling up with your fingernail, the viewfinder is very blurry (I think I got some mosquito repellent with deet on it which has corroded the surface) and the sensor is very dusty now.
I know I could clean the sensor (though I'm a bit scared of doing so!) but I'm guessing that to fix the other things would start to cost a lot of money - and is it worth doing so on a camera that's 3 years old?
I'm very tempted to upgrade - but is 3 years a reasonable length of time for a camera to last?!? It doesn't seem that long to me...
I know I could clean the sensor (though I'm a bit scared of doing so!) but I'm guessing that to fix the other things would start to cost a lot of money - and is it worth doing so on a camera that's 3 years old?
I'm very tempted to upgrade - but is 3 years a reasonable length of time for a camera to last?!? It doesn't seem that long to me...
to TP 
