What is the Main Minimum Casino Age Requirement? Source: The Gaming Commission of Great Britain states that the number for internet gaming is 18. Anyone above 18 may attend a casino in California but cannot gamble or receive earnings from gaming activities.For casino games in Illinois, a player must be 21 or older per the Illinois Casino Gaming Act of 2013.Each option, online or offline, has its own rules, laws and conditions, please read this before playing. For example, large gambling hubs offer a wide selection of the best online casinos with no deposit, free spins or welcome bonuses. There are a lot of possibilities for punters who are used to playing without leaving home. Everyone can choose an option at your own discretion, depending on your preferences. 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.