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More Than 80 Percent Of Americans Can’t Afford New Cars
(jalopnik.com)
This is a most excellent place for technology news and articles.
I was told in the 90's that in America if your car was 3 years old, your neighbor might worry you weren't doing too well, and you could buy 6 year old luxury cars for peanuts.
Luxury cars are notorious for not holding their value, unless by "luxury" you mean performance cars, so that's normal.
I was born after the 90s so I wouldn't know, but generally speaking I'd always heard the average car in America is ten years old.