Mini Bent 143 Sizing

I’m confused by the sizing of the jr Bents. I’m Buying these for a pretty light 11 year old and the 143cm comes up to the top of his head. The description I’m seeing is 5-8 years old though?!?!? I get the rocker and heavy splay. But 5-8 years old seems very aggressive. Does anyone have kids on the 143 that are 10-12 years old?