I would imagine that unless you have a policy with a specific wording that restricts those drivers, you can lend the vehicle to whoever you like? I've never seen a policy with the wording to only allow drivers over a certain age. In reality the vehicle is insured, and while the driver has to be licensed, your coverage stays on the car.
I'm not saying these wordings don't exist though, I'm saying I haven't seen them. Learn something new everyday!
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