That is against the law. There is no age requirement for the NH Pistol/Revolver license. I haven't met anyone under 18 with a permit, but I'm told that a local 14 year old was granted one, but can only carry when with a parent/guardian, as it is against federal law for a minor to possess a pistol without an adult present. (Source not verified, so take it with a grain of salt) If the Sheriff denies you, please contact your district court, they will force the issue and get you your permit. On a side note, there's also no age limit for open carry. Technically, a 6 year old could open carry a loaded pistol as long as they were with a parent/guardian, for the same reason listed above.