The legal age to be in a casino varies by location, typically ranging from 18 to 21 years old. It is crucial to check the specific age requirement of the casino you plan to visit. In some regions, individuals must be at least 21 years old to enter a casino and engage in gambling activities. Always bring a valid form of identification to prove your age when visiting a casino. It is important to adhere to local gambling laws and regulations to avoid any legal issues.