I doubt there's a significant number of those though. In my family, we keep cars until they cost more to fix than they're worth, which is usually around 200-25

I doubt there's a significant number of those though. In my family, we keep cars until they cost more to fix than they're worth, which is usually around 200-250k miles. At ~10k miles/year, that's 20-25 years, which seems about in line with the 12-year old average age. Growing up, we had two family cars (not counting my dad's commuter or teenager cars) before I moved out, the first was definitely over 20 years when we junked it and the second is around 20 and is still being driven today by my sister. I currently drive a ~12 year old car with ~120k miles, and I expect to get a few more years out of it. I'll probably sell it since we want a larger car, but I'd have no problem driving it for several more years. In looking for cars, I tend to look at cars in the 3-7yo range and expect 10+ years of life with minimal issues. I just don't see a reason to spend more on a car that necessary, and cars tend to work well up to 200k miles or so these days.