If at any point in time t all the parts of the car have lasted so far, that point t is not yet the end of the life of the vehicle. The end of life occurs when a

If at any point in time t all the parts of the car have lasted so far, that point t is not yet the end of the life of the vehicle. The end of life occurs when a certain subset of the parts have failed, such that it's not economic to replace or repair those parts (except for a retro fanatic who does that because they love that car, which may even be valuable as a collector's item). It's worth mentioning that a gasoline car made with perpetual, indestructible parts will be end-of-lifed when the infrastructure disappears: it cannot be gassed up anywhere. We can regard gasoline as a part that's always requiring periodic replacement. If that's not available, the car is toast.