It depends upon each countries specific ruling but generally 13 years of age
prefferably the 85cc class
if he is just starting then 250 beg
85 cc or 150 cc
125 or 250 if you fit on the but but they run together in the 250 class
First of all, you can't play motocross, you race motocross. Motocross is the outdoor version of dirt bike racing. Supercross is indoor. Professional motocross racers race for 30 minutes plus 2 laps.
Depends on height and weight.
probaly like 15 years old or more you just have to the right size to fit it
25+ vet A and vet B or 40+
A national motocross race consists of two (2) 30 minute plus two laps motos.
30 is considered an old timer in professional motocross. There are a few exceptions though, as long as you stay healthy (injury free) and are competitive.
motocross started when people decided to race road motorcycles on dirt
motocross started when people decided to race road motorcycles on dirt