Whether a 9-year-old should have a dirt bike depends on several factors:
With these considerations in place, riding a dirt bike can be a fun and rewarding experience for a 9-year-old.
between 150cc and 250cc
a 120cc dirt bike is suitable for a 17 year old
I would perfer a Honda CRF 50 there a very great 50cc training bike
an exercise bike would be the best start
no you have to be at least 14
Yes
Try a Yamaha TTR 125 or CRF 150 (not the motocross version).
No.
A Yamaha 125
a xr 100
For a 13 year old it depends on your size and your experience with dirt bikes, but an 85 is usually the best size bike and fastest for a 13 year old. Unless you are really tall which you would need a 125.
yes just get them a 50cc or 70cc dirt bike