Back in college, I spent a summer in Israel. They didn't have a drinking age. Most of the people I talked to there were convinced that was a key factor why teenagers rarely have a binging issue in their country. Because, there is no "coming of age" when it comes to alcohol.
Commenting on other posts...
In NYS, you can only buy beer in grocery/convenience/other stores as long as they have a license to sell. All wine and liquor can only be bought in a liquor store.
PA is really weird. I remember once I just wanted to buy a 6-pack to bring to a party, and I had to go to an actual bar to get it. Larger quantities can be bought in specialized stores. That was a while ago. Don't know what it's like now.