In the United States, it is legal to gamble at the age of 18 in some states, including Florida, Idaho, Minnesota, and more. These states allow 18-year-olds to participate in various forms of gambling, such as casinos and racetracks. However, most states require individuals to be at least 21 years old to gamble. It is essential to check the specific laws and regulations in each state regarding the minimum gambling age. Some states may also have restrictions on certain types of gambling activities for individuals under 21.