How old do you have to be to buy the AirPods?

Hi, I’m Nam and I’m 14 years old. I really want the new apple airpods but there is a problem. I do have enough money to buy the airpods, I also have my parents permission to buy it but the problem is they can’t take me to the shop and buy it. They said if I want to buy it then I have to go alone or go with a friend. Now my question is how old do you have to be to buy the airpods? because I really really want them

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