In Oklahoma, the legal gambling age varies depending on the type of gaming. For casinos and tribal gaming, individuals must be at least 18 years old. However, for pari-mutuel betting on horse racing and for playing the lottery, the minimum age is 18 as well. It's important to note that some establishments may enforce a stricter age limit of 21 for certain areas or activities. Always check specific venue policies to ensure compliance with local regulations before participating in any gambling activities.