Jake asked: Is there any way I can make my gas bike street legal and if so what age and what license would I need to do so?
A bicycle with a gas assist motor can only be street legal if it is registered as a moped. Please see this post for all the details, including the link to the DMV requirements.
A driver’s license would also be required, the age for which is 16.
s. 322.05 – Persons Not to be Licensed
The department may not issue a license:
(1) To a person who is under the age of 16 years ….