I'm 37, own three Camaros and my 4 year old son is definately a car guy. All he wants to do is play with his Hot Wheels and Matchbox cars. When we go to car shows/cruises or vintage races he can name nearly every single kind of car we see. He knows the names of all the Trans Am race cars and their drivers from the 60's/70's. There can't be too many 4 year olds that know who Mark Donohue and Roger Penske are, in addition to George Follmer, Parnelli Jones, Jim Hall, Sam Posey, Dan Gurney, etc etc. When we go to Indycar races he can name all of the drivers when he sees their corresponding cars in the paddack or on the track. I've been teaching him this stuff since the day he was born. Cars are certainly his favorite thing just like his dad. Here are pictures of him driving and washing his own Camaro two summers ago when he was 3. I know he will help keep the hobby and our Camaros alive when he gets older.