He simply wants to be able to legally drink.
Steven D. Arnold
2

You’re actually correct on the mental health part. Under the age of 21, the brain is still undergoing development, which alcohol can hinder.

http://pubs.niaaa.nih.gov/publications/arh284/213-221.htm

http://www.ncbi.nlm.nih.gov/pubmed/11104119

http://www.ncbi.nlm.nih.gov/pubmed/10784466

The first study has several references that have additional information. The general consensus is that yes, alcohol has a negative effect on the developing adolescent brain, and can impair the ability to form new memories. Alcohol can also rewire how the brain works, which could have a positive or negative outcome.

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