In the UK - 49cc or less.
125cc
As long as you have a valid motorcycle license you can ride any size bike at any age.
A 13 YEAR OLD CAN RIDE A MINI BIKE AS LONG AS IT IS NOT ON A PUBLIC STREET.
Yes. If an 8-year-old wants to learn to ride a bike, another person can teach them to ride it. Usually, that involves helping to balance the bike until they get the hang of riding it.
A bike for a 4 year old normally requires stabilizers, unless at least he or she is able to ride solo. A typical bike that suits this purpose is one with a mountain bike (MTB) frame.
I'm not exactly sure how big a super pocket bike is, but if the bike is too small for you to ride safely, get a bigger bike.
on your driveway
Yes
yes
A very small bike
No.
yes
no