>My D700 doesn't seem to autofocus as well as it used to when >using non-center AF points. Is it possible for the AF sensors >to degrade with age? I wouldn't think so, but I don't >understand how they work. > >The other possibility is I am shooting differently than I used >to, e.g. the edge sensors aren't as good but I used them less >in the past and didn't notice.
I think it may be the latter.
They don't degrade with age any more than the overall camera does.