 Happy birthday, you just turned 21. You can now legally buy alcohol. But if you're thinking of buying a beer for that friend who is still underage, think again. 21 means you're legal to buy, not supply. It could cost you $1,000 in fines and up to 100 days in jail. And the physical cost is even higher. Emergency room visits, traffic crashes, violent crime, and more. Remember, 21 may be old enough to buy, but don't supply. A public service message from the Michigan Liquor Control Commission.