OTH asks why some of us buy new cars and run them for 20 years and lots of miles.
Night Train has already basically answered that. We know we're going to be using the car for a long time and by buying new can get exactly what we want. Also, in practice, buying cars which aren't fashionable (but very well engineered and built) it's nearly always possible to negotiate a price which is no more than the forecourt price for a 1 year old low mileage one. Our depreciation cost per year is low - I expect mine to work out at about £500 and NT's should be about the same.
OTH, buying 2nd hand and then doing much the same might achieve slightly lower depreciation, but as a proportion of total car operating costs it won't be significant.
Like OTH I get rather negative reactions from the wife to my tendency to keep everything until it's completely worn out, but I've never understood the throw away mindset. I keep on mending things until either it's uneconomical or impossible.
Many students and other cash starved groups used to like the Eastern Block era Skodas. Although the designs were from the 60s and 70s, the Skodas, unlike the Ladas and FSOs, were well made and with minimal expense would go on and on. The 1980s Skodas were 'orrible to drive though. I only did so once and nearly crashed it twice, once on the first bend and once when I needed to brake hard.