Wow, a lot of individuals here who act as if they are a predator of some sort.
Mean up with the damn boy and conduct business.
Maybe because in some jurisdictions law enforcement have been known to entrap regular people with stupid charges - e.g. assisting a minor to buy drugs online.
Personally I would sell to a 15 year old but if he starts volunteering weird information I never asked for then I'd back off.
Yeh, it seems weird to me that he would state his age. Seems suspicious to me. Is it illegal to sell bitcoins to minors?