I don't drink, largely because I've seen the bad side of what it does to people (alcoholism does very ugly things to people!)
Consequently, I will probably never drink, and I have very little tolerance for others that do so in my presence unless I know them well and trust that they won't overindulge (beer is the drink of choice for most of my drinking friends and acquaintances, but I've met a few who prefer other things, usually some sort of wine).
Be that as it may, I might consider tasting a nonalcoholic wine or beer at least once out of curiosity, if the opportunity ever arose, though I'd never actively seek it out myself because, again, I'm not into it.
As for the drinking age being 21, I don't particularly care at what age people drink, as it's their decision to do with themselves what they will (for better or worse), so long as they do so responsibly and, for those who are old enough to legally drive a car, not drive while intoxicated (this is a leading cause of fatal traffic collisions in the US).
</rant>
c