The younger you are when you start drinking, the greater your chances of becoming addicted to alcohol at some point in your life. More than 4 in 10 people who begin drinking before age 15 eventually become alcoholic.
It is possible to drink legally and safely—when a person is 21 or older and drinks in fairly small amounts. But if you’re under 21—or if you drink too much at any age—alcohol can be especially risky.
Just a few of the dangers of underage
Drinking too soon or too much:
…can affect your mood and your thinking.
…can hurt others, get you in legal trouble, and damage your relationships.
…can harm your body now and when you grow up.
…can get you hooked.
Source: (http://www.thecoolspot.gov) The National Institute on Alcohol Abuse and Alcoholism (NIAAA)