I too didn't like the over-simplistic choices. Like Bede, I like them all (except cheap bourbon) and don't always drink the same things. Also, I may go about a month with nothing and then maybe 10 drinks in one week.
Speaking of the extra years of drinking, I bet they didn't calculate the extra 3 that I got because I was lucky enough that the drinking age was dropped to 18 when I turned 18, though taken back up to 21 several years later. And then we have all those non-Americans who were legally allowed to drink even younger.