He's three!
He was riding his bike the other day and was showing off to a neighbour by riding one-handed. The neighbour (age 8) said "Hah! You can't do this!" and stood up on his crossbar.
Took ds out on his bike today, and, guess what, he can! Not just for a fraction of a second either.
Sorry if this sounds like a brag, but I was standing there in astonishment and had to tell someone.