The minimum age to go to casino online or offline varies by country and is also determined by the laws of casinos. In Australia, it depends on the state: some require at least 18 years, while others require at least 19 or 21 years. The casino minimum age to gamble in the United States is 21, but in the United Kingdom, it is 18. The primary requirement differs globally from 18 to 21 years old. Minimum gambling age restrictions vary based on state, and regulating rules.