This document summarizes research on the outcomes and costs of extending foster care support to age 21 in Ohio. Key findings include: - Youth who remain in care past 18 have better outcomes such as higher school enrollment and lower rates of homelessness and incarceration compared to those who "age out" at 18. - Over 10 years, Ohio would see $1 in benefits for every $1 spent by providing housing, case management and other supports to youth aging out of care. The program would pay for itself after 6 years and yield $1.81 in benefits for every $1 spent after 10 years.