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In Idaho you can open carry a firearm if you are over 18 and you can conceal carry with a license as follows:-
(11) The sheriff of a county may issue a license to carry a concealed weapon to those individuals between the ages of eighteen (18) and twenty-one (21) years who in the judgment of the sheriff warrant the issuance of the license to carry a concealed weapon. Such issuance shall be subject to limitations which the issuing authority deems appropriate. Licenses issued to individuals between the ages of eighteen (18) and twenty-one (21) years shall be easily distinguishable from regular licenses.