An old car is only as good as the person who has looked after it.
So very true.
Some people will break their cars, no matter how good it is. Years ago, when working in a Rover dealership, we had 'regular' customers. They'd buy a new car, and we'd see them at least once a month for a year. then they'd buy another new one, and the process resumed. We'd sell their old one, give it a good valet and a service, and not see it again until its next service was due.
My father was a 'breaker'. A constant stream of broken cars, some of which are still loitering, as we've not finished clearing the crap yet. Even when he got a good one, he'd find a way to break it. Then even if he knew and was capable of fixing it properly, he'd always choose to bodge it instead.
Company cars are of course, 'bulletproof'. Mainly because they are replaced before the poor treatment really shows, but later owners will reap the 'benefits' of its early life. Company car change intervals are always a difficult calculation for fleet managers, to get the best return on investment, or at least the smallest cost. The last company I worked for initially had cars changed at 7 months, then extended to a year, then two years, and lastly at three years. I worked with a guy who's car was just due at the time of the policy change, so just as he was specifying his next car, the change date was moved, then again, and again. It was funny to see. As he was informed that his two year old car would be kept for another year, he protested, stating that it would probably not last that long, as it was a complete shed. I just asked, "Haven't you had it from new?" Yes!
Fastest car in the world? Any hire car.