The passenger has to be 21 years old ("fully legal").
18 with a valid drivers license
No No
you must be 15 to receive your permit, and 16 do get a license and drive on your own. Minnesota also has the option of a farm permit for kids to help their parent/guardian on farm work.
That would be a learner's permit.
yes but you need someone that has a drivers license that is an adult in hte car
A driver with a permit can only drive if someone with a license is in the car.
no
You need someone to teach you, then you need a permit and a license.
Yes with someone 21+ that's had their license for atleast 6 months
If those are the only occupants of the car then neither can drive legally.
Depends what state you live in. For example, in Minnesota, you are required to take a driver's education class, drive with a permit for 6 months at age 15, then get a license at age 16. In Arizona, you are required to drive with a permit for 6 months at age 16, then get your license at age 17.
Someone with a driving license from the Republic of Ireland can drive in Northern Ireland.
Not if the license holder is too tired to stay awake or is sleeping. The license holder is deemed to be 'in control' of the vehicle - that is the reason for the law about accompanying a permit holder exists in the first place.