My parents let me drink alcohol well before I was of age, simply because they wanted to create a mindset that alcohol is no different than any other drink and as such, there's no reason to drink it irresponsibly. They thought that if they let me have a little along the way, I wouldn't go buck-wild at 21, start binge drinking, drinking and driving, or anything else irresponsible. It worked too. ;-) At 21, I didn't have the same, "Oh my God, let's go party and get wasted!!!" attitude that all my 21-year-old friends had.