You have to be at least 21 years old to enter a casino and gamble in most places around the world. This age requirement is strictly enforced to prevent underage gambling and protect young individuals from the risks associated with casinos. Casinos typically check identification, such as a driver’s license or passport, to verify a patron’s age before allowing them to enter. It is important to adhere to these age restrictions to ensure a safe and responsible gambling environment. Remember to always gamble responsibly and within your means to avoid potential problems that can arise from excessive gambling.