A UK 2001 report from the Commission for Integrated Transport puts the Brittish car's life expectancy average at 13.95 years, and a scrappage chart of cars in the UK shows that most cars there are put to scrap in years 13-17. Some die in year 1, some go past 22, but...
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A 2006 US DOT updated report finds that the typical passenger car will travel a lifetime mileage of 152,137 miles (25 years), while light trucks will travel 179,954 miles (36 years). This is given as when the surviving number of those vehicles reached below the 2% mark. Previous governmental reports used 126,665 miles for passenger cars (20 years) and 153,698 miles for light trucks (25 years). These numbers are used to estimate the impact of proposed fuel economy standards or future fuel consumption/operating costs. If you look at the charts on page 9 (12 of the PDF) and 12 (15 of the PDF), you'll see that the 50% point (where half of the vehicles are no longer surviving) is around 13-14 years.
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