Both of my previous digital cameras are still working just fine. The oldest being a Kodak DC3200, bought ten years ago. The biggest barrier to continued function in a camera is the battery, and that old dear takes four AA cells.Not sure many digital cameras would make it 10 years and still be working. Things change pretty fast.
Alan, my first digital was the Canon G2 as well, and I acquired it in early 2001 as best I can recall. I still have it and it still works, although I no longer am able to see that tiny LCD. Sentimental value; will never let go of it! Still have my Canon A1 and EOS Elan; my wife just shakes her head when she opens the closet...I selected 2010 as that is when I got the camera's that I use most, Canon5D MkII and my GF1. But could have ticked a few of the boxes if not all if I went back to my film days and my eos film bodies first of which was the Eos 600 then the Eos 5 both of which I still own, which would fall into the oldest catagory plus 10 years. Digital wise for my self think it would be by canon G2 from about 2001? which again I still have but does not get any use now.