History of Firearms in the United States. Age 0-4. Age 5-8. Age 9-12. Age 17-19. Age 20-24. Age 25-29. Age 30-34. Age 35-39. Age 40-44. Age 45-49. Age 50-54. Age 55-59. Age 60-64. Age 65-69. Age 70-74. Age 75+. Firearm Laws and Regulations. Gun Control Measures. Facts verses Fiction. Weakness in the Data Collection System.