I know a few others in the tech industry who also spend their spare time collecting and restoring old cars, as in made more than 50 years ago. Parts and documentation are surprisingly available, and there's an extensive aftermarket thanks to a general lack of DRM-ish things --- these were made even before microcontrollers, so they're as "unconnected" as possible, and anything that goes wrong tends to be a relatively simple fix. Manufacturers were more concerned with actually making good products than locking out competitors or planning obolescence. The lack of annoyances such as needing to wait for the radio to "boot up"[1] or controls hidden behind layers of menus is also a plus.
They may not be as safe, fuel-efficient, nor environmentally friendly as today's cars, but there's a certain amazingly pleasant and comforting feeling of freedom in driving one. It's hard to describe.