In the United States, you can be 18 to gamble in some states such as Florida, Minnesota, and Alaska. However, many states require individuals to be at least 21 years old to gamble in casinos. It is important to check the specific age requirements for each state before participating in any gambling activities. Additionally, some states allow individuals as young as 18 to participate in certain forms of gambling, like the lottery or bingo. Always verify the legal gambling age in your location to ensure compliance with the law.