You have to be at least 21 years old to enter a casino and engage in gambling activities. This age requirement is strictly enforced to ensure compliance with the law. Casinos are considered adult environments where individuals must be of legal age to participate in gaming. It’s important to have a valid ID with you when entering a casino to prove your age. Minors are not allowed on the gaming floor or in other restricted areas of the casino. Always make sure to comply with the age restrictions in place to avoid any legal consequences.