I bought my 12 year old a new 250 EX.
Then, when I was convinced he loved quading on the dunes, and was a good rider, and he turned 14, I bought him a super built YFZ 450 and life is great,,,
The YFZ so awsum,, I sold my built Raptor and bought myself one too.

Son on his YFZ 450 at Dumonts "Big Mo"