The legal age requirement to enter a casino varies depending on the country and state regulations. In most places, you must be at least 18 years old to gamble, but some regions require individuals to be 21. It is crucial to confirm the age limit before attempting to enter a casino to avoid any legal issues. Casinos typically check identification to verify the age of their patrons upon entry. Minors attempting to enter a casino are usually turned away to uphold the law and ensure responsible gambling practices.