Gambling laws are different in every state and it’s important to know the age requirements for each. There are seven states that allow gambling at 18 and they are, Montana, New Hampshire, New Mexico, Rhode Island, Tennessee, Washington D.C., and Wyoming. New Mexico only offers in-person betting while the others offer mobile and online as well as in-person. Every other state requires bettors to be 21 in order to play but there are Offshore Sportsbooks that operate in their own jurisdictions allowing bettors to be 18.