BEGINNING MONDAY, YOU MUST BE 21 TO NOW PURCHASE A GUN IN COLORADO. SENATE BILL 23-169 NOW MANDATES THE SALE OF GUNS TO ONLY PEOPLE AGE 21 OR OLDER. SELLING A GUN TO SOMEONE YOUNGER THAN 21 IS NOW A MISDEAMENOR WITH A PUNISHMENT OF UP TO 18 MONTHS IN JAIL. SOME GROUPS IN COLORADO SAY IT WILL BE A DETERRENT TO LIMITING GUN VIOLENCE IN COLORADO, AND ESPECIALLY GUN VIOLENCE COMMITTED BY TEENAGERS. OTHERS FEEL IT IS ANOTHER INFRINGEMENT ON GUN RIGHTS.