In my day (the 1950s), the common thought was that you should trade in your old car for a new one after 60,000 miles. After that, the increasing repairs would become too costly.
Today, of course, a car with only 60,000 miles would be considered almost new. No one talks about mileage as a guide for trade-ins anymore, but if they did, it would be something over 200,000 miles. That’s a big jump in reliability. Cars have gotten much better over the years.