You can see below an infographic which shows you some stats about the alcohol use in United States. For example, 50% of adults are current regular drinkers. Also, 39% of kids aged 12-17 years had at least on drink in their entire lifetime. 63% of full-time students drank past-month, while 53% of part-time students had past-month alcohol use.
Personally, I think that teenagers should drink less. Why? They have a future and what would they have if they are ruining it?
This infographic shows you more than I have described above.