What you see here is a list of the cars most often purchased by senior citizens, and thus, the fact that the Lincoln Town Car, Buick Lucerne and Cadillac DTS are the top three spots should come as no shock whatsoever. But look at the fourth place listing - the Cadillac CTS Sport Wagon. That's right, General Motors' Art & Science cargo-hauler accounted for a whopping 74.2 percent of all senior citizen car sales CTS Sport Wagon sales between 2009 and 2010. That's a whole lot of cool grandpas.

Scan further down the list and you'll see other no-surprise entries like the Chevrolet Impala, Buick LaCrosse and Toyota Avalon. But then there's the Porsche Panamera, which takes the 11th place spot, accounting for 53.3 percent of sales to these 65+ drivers meaning that 53.3 percent of all Panameras sold were to the 65+ crowd. Even more cool grandpas.

The TrueCar.com study also ranked the top brands for senior citizen buyers during 2009 and 2010, with Buick, Lincoln, Cadillac and Chrysler taking the top spots with 57.5, 47.7, 44.0 and 36.1 percent of total sales going to senior citizens, respectively. Only 29.5 percent of Porsche sales are to the older crowd, putting it in seventh place. See the full results of this study in our image gallery below.