Volvos, like any cars, have well-known failure modes, which in part is why we assembled the FAQ. ECUs don't last forever, radiators and hoses have finite lives, wiring harnesses and plastics degrade. If you know about them, you can plan for an orderly diagnosis and repair, even a preventive repair well in advance. No car will remain pristine forever in daily driving: plan for a slow, inexorable, but manageable decline.