The minimum age that one can obtain car insurance will differ depending upon state laws and insurance companies' guidelines.
In general, one must be an adult (18 or older) to obtain an insurance policy on their own. If you are under 18, and thus still considered a minor, then normally state laws and insurance companies guidelines will require you to have a parent or guardian sign on legal documents, such as an insurance policy, with you.
Typically, if you are old enough to have a driver's license or own a car, you can buy an auto insurance policy, but if you are a minor, your parent or guardian will usually have to sign on the insurance contract with you. It may be in the driver's and the parent's best interest to have the teen driver on the parent's policy. Read our parent's guide to insurance for teen drivers to find out if this is your best option.
If you are a minor and what to own and insure a vehicle you should check with your state's Department of Motor Vehicles and insurance regulator to see if there is a minimum age set and what extra measures you may need to take until you become 18 and considered an adult.