Yer i know, its pritty extreme for a 16 year old :P
I've done 100 hours on my rxp, and i've loved every minute of it. I love going fast and hate loosing a drag :P But i am aware of the dangers aswell so i always ride within my limits.
DaveO you can race a RXP-X at 16 yrs of age as long as you have the required local licence and purchase a AJSBA race licence on the day.
I dont think 16 is too young for runabout racing as us oldies all know too well we often get wooped by kids on Motocross bikes and with practice the 16yr old kids are infact more capable with there added reflexes and fitness..