Personally, I think it isn't the age of the people who drink, but the culture of drinking they grow up in. This is not a criticism of American culture - we have a similar problem here.
Ideally, children should be introduced to the concept of social drinking as early as possible. Parents who take their children out to restaurants, or have the odd glass of wine with the family meal teach their offspring to drink responsibly.
The US currently has the highest legal drinking age in the world. I don't think raising it will help teach a more responsible attitude to consumption, it will just drive it underground, as did Prohibition.
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