There are two types of law: criminal law and civil law, or sometime characterized as criminal law and everything else.  Juvenile Delinquency is not considered criminal law but civil law, so when a juvenile commits an act that would be considered a crime if they were an adult, it is not called a crime but a delinquency, even though the “prosecutor” refers to the criminal statutes when making “charges.”  When a juvenile enters a plea to a delinquency, the plea is not “guilty” or “not guilty,” but “true” or “not true.”