Yeah, because a car has tens of thousands of parts that age with both time and usage. The core drivetrain is just a tiny bit of that.

Everything is falling apart and that makes and old, used car... Used and old. Now queue the people who show up to say they haven't changed a tire or wind screen wiper blade on their 2012 Model S/Camry and can't perceive a single difference to when they were new from factory.