Final answer:
The legal drinking age in California and all other states in the United States is twenty-one, which is a result of the National Minimum Drinking Age Act of 1984.
Step-by-step explanation:
The minimum age to legally purchase or consume alcoholic beverages in
California is twenty-one. This is due to the National Minimum Drinking Age Act of 1984, which required all states to set the minimum drinking age to twenty-one or risk losing a significant amount of federal highway funds.
Although the Twenty-First Amendment gives states the authority to regulate alcohol, this act created a uniform age limit across the United States.