I agree with y'all. At 18, we're supposed to be able to make an informed decision as to who we can vote as President, but you can't make an informed decision about drinking until 21...same with signing up for military. Either raise it all to 21 or drop it all down to 18. FYI, most rental car places and even some hotels prefer you to be 25. I'm 23 and had a heck of a time renting a room in Florida. They wanted a $200 deposit because I wasn't 25...as if 2 years magically makes a difference. I managed to get around it, but I still felt it was a tad age discriminatory. Same with renting a car. When I visited Joey in CA, we rented a car. At first they wouldn't rent to us because we're 23 and not 25. But, because he's in the Military, they dropped the age requirement down to 21, so we could rent the car.