Under existing law, the age of majority is 19 years of age. Also under existing law, juvenile courts have original jurisdiction over criminal acts committed by children under 18 years of age or, in certain circumstances, under 19 years of age; child in need of supervision matters and commitments to the State Department of Mental Health for individuals under 19 years of age; and certain crimes relating to juvenile delinquency committed by individuals over 18 years of age. This bill would provide that juvenile courts have original jurisdiction over criminal acts committed by children under the age of majority; child in need or supervision matters and commitments to the State Department of Mental health for children who are under the age of majority; and certain crimes relating to juvenile delinquency committed by individuals over the age of majority. This bill would provide that a child who has not arrived at the age of majority may not be detained or confined in any jail or lockup for adults, with exceptions. This bill would also delete duplicative language and make nonsubstantive, technical revisions to update the existing code language to current style.