Traditionally by getting on it and providing forward motion with the use of the pedals. usually children learn to ride a bike before that age.
A 13 YEAR OLD CAN RIDE A MINI BIKE AS LONG AS IT IS NOT ON A PUBLIC STREET.
As long as you have a valid motorcycle license you can ride any size bike at any age.
no a 13 year old can't get a job in Los Angeles because he isn't old enough.........
they are generally illegal most everywhere to ride at that age... and i am a BYU fan!!