For bigger cars, SUVs or vans, the age difference is flipped, 6.9 years in Norway and 7.5 years in the US. There is enough difference in the car models between the two continents to explain staring googly-eyed at trucks when you get to the states, without resorting to emotionally inflated statistics.
This article is pretty shallow in my eyes. It adds nothing to any debate (I'm not sure what debate it is supposed to add to) and is full of hyperbole and superficial conclusions based on one person's observations.
[1] http://www.ssb.no/english/subjects/10/12/20/bilreg_en/ [2] http://www.autoblog.com/2009/03/04/study-median-age-of-cars-...