Minor

One who is legally underage and does not have all the legal rights as an adult.

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Additional Sources

Answers.com

Being under legal age; not yet a legal adult.

Duhaime Legal Dictionary

A young person not yet of the age of majority.

Law.com Dictionary

n. someone under legal age, which is generally 18, except for certain purposes such as drink-ing alcoholic beverages

Legal-Dictionary.org

An infant, or person under the age of legal competence and independence.

Wikipedia

The term minor is used to refer to a person who is under the age in which one legally assumes adulthood and is legally granted rights afforded to adults in society. Depending on the jurisdiction and application, this age may vary, but is usually marked at either 12, 16, 18, 20, or 21. Specifically, the status of minor is defined by the age of majority.