I joined with louisiana state police when i was 19 years old. I had to take not one but two extensive groupings of psychiatric testing. One called the Matrix test. Its a test all police officers have to take. And another one because i was under 21, and had to prove my maturity, and that i was mentally fit to deal with all that went on with my profession. I believe that a mental evaluation for anyone, whether it be 21 or 60, to be able to purchase or consume alcohol.
My main argument of lowering the drinking age is because male or female, the human body's organs are not fully developed untill around the age of 21, and with the damaging substances that are in alcoholic beverages, and the immaturity to accept this by younger people, the age should stay at 21. I personally believe that tobacco products should be raised to 21 for the same reason.