In 2026, if you are caught inside a casino under the age of 21 (in states where 21 is the legal minimum, like Nevada or New Jersey), the consequences are severe for both you and the venue. Security will immediately detain you, and in most jurisdictions, you will be issued a criminal citation for "Underage Gambling" or "Trespassing." This can result in fines ranging from $500 to $1,000, and in some cases, a permanent ban from all properties owned by that gaming corporation. If you have won any money, all winnings are legally forfeited and cannot be collected. For the casino, the stakes are even higher: they face massive fines and potential suspension of their gaming license. In 2026, many major casinos have implemented AI-driven facial recognition at entrances to flag minors. Note that some tribal casinos and states like Rhode Island or Minnesota allow entry at 18, but the 21+ rule is strictly enforced in major hubs like Las Vegas and Atlantic City.