The law mandates that people must wait until they are 21 years of age in order to consume alcohol, on the grounds that that is the age at which the body is fully capable of handling alcohol. But it is well understood in biology and physiology that people's bodies grow and develop at different rates depending on any number of factors: environment, genetics, etc. And that is just the physical aspect of it. There is also the mental aspect of understanding the potential dangers of alcohol and knowing how much is safe to consume. Many 18 - 20 year old college students consume alcohol without any harm resulting. Is it accurate to draw a line in the sand and say "this is when you are ready for alcohol"? Sartre says that "existence precedes essence" which I interpret to mean that people are responsible for determining the course of their own lives. So shouldn't we have the freedom to determine for ourselves when we are ready for alcohol? Why should the government make that decision for us? If a person is both physically and mentally capable of drinking alcohol, but under the age of 21, then to enforce the minimum drinking age against that person you would be relying on argumentum ad baculum, wouldn't you? It seems like a violation of human dignity to deny me autonomy over my own digestive system.