According to Memory Alpha, Data was less than 50 years old when he "died". However, in the double episode Time's Arrow, we see that Data's head was left in a cave (undiscovered, sadly) for 500 years. It was later reattached, of course.
But that makes his head 500 years older than his body! Was this ever referred to in later episodes? I would have thought that it being left for in a dusty cave for five centuries might cause problems.