Since the brain doesn't fully mature until age 25 it is confounding to understand the other previously made decions, especially military service and voting age. Common sense, a litte known practice tells us there should be consistency and it SHOULD be higher. Tobacco, alcohol, military and voting 22 years of age. Driving, 18 years unless work permit at 16. Of course that would be too much to hope for...maybe 21 years for tobacco, alcohol, military and voting would do for now.