Cars overall last way longer than the 60s and 70s cars my dad ever owned. He took care of them, but the most you could get out of a GM product was about eight years, as by about 75-80 thousand miles, the body (and possibly floor, like in the sh*tty '71 LeSabre we owned) would be badly rusted, and mechanically, too many things were going wrong with it. I would loved to have kept our '65 Wildcat to drive to high school in, but we had to drive it to the junkyard by 1975.
In comparison, my CR-V turned 20 this year. It has some rust and minor issues (mainly "old age" stuff), but it sits at 289,000 miles on its original engine and transmission, still running fine. The 2002 and 2004 Hondas in the family have no rust. And that's not just one brand--we have many older cars in the area now, just about all brands, that have little to no rust for their age, many over 100,000 (often 150,000) miles, still running well and nicely cared for.
Yet I also agree about some owners not taking care of cars. As a contrast to what I just wrote, there are some newer cars around this area that are smashed up, dented, rusted, running poorly, filthy inside and out, and they are only a few years old. (Some brands also do not age well.) I still hear the occasional story of someone pulling into a shop or dealer with an engine that barely runs, and the owner had no clue the oil needed to be changed after driving it 80,000 miles. Even when looking at used cars for my daughter, the condition of many in her price range was appalling. Some that were ten years old looked as though they had never seen a vacuum cleaner since the day it came off of the car dealer's lot. I seriously wondered how anyone could dump so much money into buying and insuring a vehicle, then totally neglect it!
However, these days there are quick lube shops on nearly every corner. We didn't have these decades ago. I don't trust them myself, but at least it gives most cars a better chance at longevity since those shops are a continuous reminder that cars do need maintenance. Some repair shops (even the dealer) will do a free multi-point inspection when you bring a vehicle in for repair, the most honest of them pointing out the real issues vs. inventing some just to make a profit (which is what the quick lube shops often do, recommending service long before it is due).
Anyway, I'm hopeful that enough owners out there are at least making use of the quick lube shops to get regular and proper fluid changes so we have a better chance at seeing these as "classics" in future decades.