In Minnesota, you must be at least 18 years old to participate in charitable gambling activities. However, to enter a tribal casino and engage in casino gambling, you need to be at least 18 years old. For other forms of gambling, such as the state lottery and horse racing, the minimum age requirement is also 18 years old. It is essential to verify age requirements at specific casinos or gambling establishments as they may vary. Remember to always gamble responsibly and within legal age limits.