Should anyone be allowed to buy a gun?

18 and 21 are the ages to be able to buy a gun, and some think it is too young and others too old. I do believe that we should have a legal age limit for guns, but I really do not know which age would be the best. For a rifle you have to be 18 to buy, and 21 for a handgun. Guns are very dangerous, and some people at these ages are not mentally ready to handle a gun. Age is not the only stipulation that should be put on guns, I think that everyone should have to pass a test of some sort. Guns have ended many lives and should not be passed around so easily, I just hope later on down the road, some higher stipulations will be put on what and when you can buy rifles, and other firearms.