I use a Pentax *istD that was manufactured in Dec. of 2003. I'm actually the second owner, it was given to me. While it doesn't have the fancy stuff of todays camera, and just has basic functions, it works perfectly. It does seem to underexpose a bit in auto mode, or it might just be me, and I have no idea how many shutter actuations it has because every time I try to find out no matter what site I use it can't find the number.
Now this camera was owned by a semi professional photographer who I'm sure took premium care of it before he upgraded. But if you can find a gently used 10 year old camera there is no reason why you couldn't use it for experimenting or some basic stuff. I'm actually enjoying NOT having some of the fancy stuff like the pre set scene modes, because I'm having to actually learn exposure first.
Well... hopefully I'm learning....