Question: do you have to be 21 to go to a shooting range

Answer: No, Typically, no license or advanced training beyond just firearm familiarization (for rentals) and range rules familiarization is usually required for using a shooting range in the United States; the only common requirement is that the shooter must be at least 18 or 21 years old (or have a legal guardian present), and must sign a waiver prior to shooting.