The legal age for gambling in the United States varies by state and the type of gambling activity. Generally, the minimum age is either 18 or 21. For example, most states require individuals to be 21 to enter casinos, but states like New York and Michigan allow 18-year-olds to gamble in Native American casinos. The legal age for purchasing lottery tickets is typically 18, and sports betting is generally restricted to those 21 and older, although some states set it at 18. Online gambling age requirements also vary, with many states requiring participants to be 21.