Jesus fucking christ you guys are just dickish.....What is wrong with a 19 year old buying a new car? First off, its a great way to establish your credit. Second, even if it's a mistake, better to do at age 19 then age 39 where he would have plenty of time to fix it. He also has plenty of time to start saving and worry about retirement.
Car loan for a $19 new car will build or break his credit no different then a $19K used car.
Hell for once I can say this... I'd rather buy a corvette.