motorbikes

what is a good age fro kids to start riding motorbikes (as in dirtbikes) because mny step dad is getting me one for christmas and i was just wondering what other people think about it. IF you have a motorbike or want one then what type and how many cc's.
Deleted user

u can get a 50cc bike for begginers, but if u are really crazy, u can get a 500cc. nah u can start on a 150cc bike, it's fair, good for just riding around, too much power will get u hurt if u don't know how to control it. i just mess around with the 50cc alot.

yeh i have riden before but hes already got my bike but i don't no which one