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 personâ€™s 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)]