I totally disagree: age in itself plays a very small role (o.k., foam seals, etc., for those cameras which have them).
A mechanical camera can almost always be repaired by a good repairperson.
An electronic camera on the other hand, if some proprietary electronic component is no longer available, is simply a paperweight.
Also, auto-everything cameras have far more components which could go bad; AF motors, advance motors, LCD screens, many more electronic circuits, possibly lots of plastic, not to mention all the *necessary* extra "features", many of which could contribute to a catastrophic failure.