Nearly every young adult who experiences long-term disconnection—from work, school, and community—falls into one or more of the following groups before age 19: teen in foster care, juvenile justice involved, teen mother, or high school dropout. This report, developed by Jacob Rosch, Dana Brinson and Bryan Hassel for the education program at the Annie E. Casey Foundation, is an update of Michael Wald and Tia Martinez’s 2003 Connected by 25 research. This data update provides the most-recent available estimates of these four teen populations and shares additional information about the changes in these populations, possible trends for the future, and the impact of these changes on the services designed to intervene with and support these vulnerable youth.