In a general sense, they cover roughly the same age range, but they have different uses. Juvenile , if we wish to define it more carefully, is a legal term: it is ' A person who is under eighteen years of age; or for the purpose of proceedings and disposition because of an act of juvenile delinquency, a person who is under twenty-one years of age', according to one law dictionary-- in any case, it refers to someone not yet a legal adult. '
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