under age
Below the age of majority—that is, not old enough by law to vote, marry, or sign legal agreements without one's parents. Typically refers to being under the age of 18, the age of majority in the United States, or 21, the age at which one may legally purchase alcohol. Spelled as a single word if used before a noun. He was sentenced to five years in prison for dating a girl who was under age. Bars caught serving underage college students risk losing their liquor license.
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