Do you have to be 21 to drink or what?

If you want follow the law, your must be 21 (In Most Areas Of The U.S.). In Germany, you must be 16. In the UK you must be 18. If you live in the US for instance, and your parents elect to provide you with a spot of liquor, you will be in compliance of the law. However in the US, you cannot drink (legally) under the age of 21.