It depends on the particular laws of your state. Your local law enforcement agency or DMV opffice can tell you. The laws for your state may also be found on the state Department of Motor Vehicles or Department of Public Safety website.
yes
Yes
yes
Yes, but only if you are going locally to and from fields or from field to field.
Yes, but ONLY temporarily.
Yes.
no, because a tractor is not allowed on a highway even if you do have a license to drive
yes they can but only temporarily. from farm-to-field or field-to-field only.
any vehicle with farm tags on it can be driven on highway without a license in the commonwealth of VirginiaAdded: PROVIDING that the tractor operator is engaged in moving the equipment from farm to field or field-to-field. It cannot be used for general transportation
Yes, under agricultural laws, it is legal.
No, you'll get a heavy fine.
I think you have to be licensed to operate farm equipment on a public road, but the minimum age for that is usually lower than for a regular license.