State laws vary greatly regarding at what age someone can own car in their own name. So to find out if your state has a minimum age set for placing a car in your name solely and registering it you would need to check with your state's Department of Motor Vehicles or like agency.
In general a juvenile/minor cannot enter into a contract so thus cannot be a sole owner of a motor vehicle. A minor typically cannot own property, his or her parents technically own that property until the child becomes an adult. In many states if a parent will co-sign on a loan for a car, the juvenile can buy a car, but the parent will be the legal owner.
So in many states will be required to have a parent or guardian sign with you on any legal documents such as registration, a title and even your auto insurance policy. There can be exceptions to the generalization mentioned above though, once again depending upon state laws, so that is why it is important to find your state's specific laws.
[Let CarInsurance.com help you find affordable auto insurance now.] For example in Texas there are no age restrictions for an individual to be recorded as the owner of a vehicle. However the TX DOT states that insurance companies may impose age restrictions on persons they insure and may charge higher premiums for certain age groups. Since proof of financial responsibility (liability insurance) is a prerequisite to obtaining Texas registration, an individual's ability to obtain this insurance may limit his ability to register his vehicle.
In North Carolina the DOT states that their laws do not set a minimum age limit as to ownership of a vehicle as long as the owner can sign their name on the application of title. However a plate cannot be issued without proof of owner having liability insurance on the vehicle and insurance companies normally will require you to have a parent or guardian sign your insurance documents (contract) if you are under 18 years of age and thus still considered a minor in the eyes of the law.
Even those states that will permit a teenager to register a car may require a parent or guardian to sign on any legal documents or contracts since they are still a minor. For instance, the Ohio Bureau of Motor Vehicles (BMV) states if you are under 18 and want to title a vehicle, your parent or legal guardian must complete a minor consent form. A parent or legal guardian must also accompany you when you appear in front of the Clerk of Courts title office staff to have a vehicle titled in your name in Ohio if you are a minor.
If your state allows you as a teenager to own car in your name only than your parents would need to check with their insurance carrier to see if they could place your vehicle on their policy or not. Technically your parents would not have insurable interest in your vehicle to insure it so they may not be able to do so and thus insurance would need to be in your name as the registered owner.
Once you find out your state's laws for titling and registering a vehicle as a minor and if you cannot place a car on your parent's policy you can contact insurance companies for quotes and for their guidelines on a minor obtaining a policy. Most insurance companies will require a parent or guardian to sign on an auto insurance policy with you since it is a legal document.
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So the minimum age that one can buy a car and title it in their name and then obtain car insurance will differ depending upon state laws and insurance companies' guidelines.
To see if your particular state has any laws or regulations regarding the minimum age to buy an auto insurance policy and as a minor if there are any consent forms for a parent/guardian to sign, contact your state's insurance regulator. This state agency can tell you if there are any extra measures you may need to take to have a car insurance policy until you become 18 and considered an adult. | 
