I would let him go for it if he wants to - not quite the same, but my 2yo has been scooting for about 9 months whereas the girls didn't get it until they were about 3.5: I don't believe that their ability is fundamentally different, it's just that I put x on a scooter a year younger than the girls and therefore he can do it. I think that letting them explore their own limits is really important, and if it is something he really wants to do then he is likely to be good at it. And lol at him pretending to be all cool and 16!