In California, the legal gambling age is 18 for lottery and bingo, but 21 for casinos. This means you must be at least 21 to enter and gamble at any casino in the state. The minimum age to play the lottery or bingo is 18, but for other forms of gambling, such as poker or slot machines, you must be 21. It is important to have a valid ID to prove your age when entering a casino or participating in any form of gambling. Make sure to verify the age requirements at specific establishments before attempting to gamble.