What is the minimum age of a person, of a pillion / passenger on a 50cc scooter / moped (vespa) in CA.?

What is the minimum age of a person, of a pillion / passenger on a 50cc scooter / moped (vespa) in CA.

Considering buying a scooter to avoid commuter traffic, but also have to drop child at school. Currently studying motor bike test and it does not give this information.

passenger needs to be able to wrap arms around driver and lock hands,also passenger has to be able to touch foot pegs with feet..

Get a real motorcycle. It will be safer for you and your kid.