Extends juvenile court jurisdiction over serious cases to age twenty-five and modifies conditions under which a person is subject to exclusive adult jurisdiction.

Requires the department of children, youth, and families to take appropriate actions to protect younger children in confinement from older confined youth recognizing the potential: (1) For positive mentorship; and

(2) For risks relating to victimization and the exercise of negative influence.

Requires the state institute for public policy to assess the impact of this act on community safety, racial disproportionality, recidivism, state expenditures, and youth rehabilitation, to the extent possible, and submit a preliminary report to the governor and the appropriate committees of the legislature.