The average age of a car when it is traded in or sold is six in the United States and while many drivers will want to get a new vehicle immediately, sometimes a driver might be interested in the simple act of trading cars for cash so as to reduce the number of vehicles owned or to cut down on monthly expenses. While most families in the country will own at least two cars, sometimes retiring individuals on fixed incomes are likely to reduce the number of cars they own if they are in difficult financial circumstances.