I don't think the issue is fully with the age of the driver.. it is more of how ready the driver is. I know several drivers who have shown some talent and move up to sprint cars, then there are others that don't belong anywhere near a mini sprint, let alone a sprint car. Part of the issue is moving a driver up too fast; before they have earned it or have shown that they can handle a sprint car. If you can't win in a mini/micro sprint, or a tq, then you don't belong in a sprint car.