Like I said earlier, age limits are a statistical generalization based on the most common situation. There always will be exceptional people that don’t fall within the normal population. Luke is addressing the situation faced by young drivers who are exceptional at a national or even international level. The rules need to have a clause allowing for such exceptions.
On the other hand, once the clause exists, it will only be a matter of time before some overly-ambitous parent yells, cajoles and lobbies enough that his future Lewis Hamilton (not) is allowed to race and trouble ensues. Nothing’s perfect.