Here's a stupid question. Whats the minimum age of someone behind the counter showing firearms to people? I would assume at least 21?
Not sure on your local/state law, but there is no age requirement federally. The only requirement per ATF:
Q: May an employee of a licensed dealer, such as a manager or clerk, who is under 21 years of age, sell handguns and ammunition suitable for use in handguns for the licensee?
Yes, if the employee is not a prohibited person (e.g., a felon). However, to sell handguns, a person less than 18 years of age must have the prior written consent of a parent or guardian and the written consent must be in the personís possession at all times. Also, the parent or guardian giving the written consent may not be prohibited by law from possessing a firearm. Moreover, State law must not prohibit the juvenile from possessing the handguns or ammunition.
[18 U.S.C. 922(x)]