The legal gambling age in the U.S. depends on the jurisdiction and type of gambling. Generally, the legal age for sports betting and other casino gambling is 21, with activities such as the lottery, daily fantasy sports and horse betting commonly allowed at 18. However, there are many exceptions.
While 21 is the more common age limit, there are states in which you can bet on sports if you are at least 18 years old. Each state determines its own age requirement and there are some states with different age levels, depending on the location.