One of our club members lets his 6 yo race an LST2. We had to take him out of Jr novice class because he was kicking tail on kids twice his age! At 6, he is somewhere in between the Jr novices and the adult novices. He'll be scary in a couple of years. He started racing last year with an electric - I think it was a Rusty.
Like others have said, experience doesn't always mean competence:
original: Aldous Huxley
Experience teaches only the teachable.