Nonsense. In Canadian law, you cannot enter into an agreement with a minor. If he is under 18 anything you are sending to him is his, and he has no legal liability to give it back.
Are you making up or have you just misread something? A minor, or anyone with diminished mental capacity, can more easily get out of a contract if it becomes clear they were taken advantage of, but that doesn't mean you can't enter into an agreement with a minor. I'm just basing that on common sense though.
Inthe US a person of the majority should *never* conduct business with persons of the minority as the minor can claim s/he did not know what s/he was getting into and they get to keep the product/service and you *have* to give them *all* their money back.