A federal judge upheld Colorado’s law requiring firearm purchasers to be at least 21 years old, rejecting a lawsuit from Rocky Mountain Gun Owners and two plaintiffs under 21. Chief Judge Philip A. Brimmer agreed with the 10th Circuit Court, stating that age restrictions do not infringe on Second Amendment rights, with exceptions for military personnel and peace officers on duty. This ruling contrasts with a 5th Circuit decision that deemed similar federal restrictions unconstitutional, highlighting ongoing national debates on gun control laws.