Car of Theseus!
Main problem is money, as time goes on, the things that wear out (mechanically wear or chemical fatigue) become more complicated (and thus expensive) to repair than you’d want to spend. Second reason is part availability, companies stop producing the parts you need and you can’t find them in junkyards; though this comes back to money; if you’re willing to spend a zillion dollars to have a bespoke wiring harness built to replace the one that fried when the insulation failed, or the plastic on the headlight bracket that cracked due to heat cycling, or the weird spacer keeping the seat on its tracks… sure. It’s just money.
But for a sufficiently “appealing” car (read: $$$$) people do all these things regularly. Wealthy people.
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