For many decades, child welfare agencies—with few exceptions—only served children. But in the past 10 years, many states have extended foster care eligibility to age 21, and some provide supportive services through age 23. This brief highlights the types of challenges and emerging program and policy practices child welfare agencies and other providers and stakeholders may face in meeting the needs of transition-age youth in extended foster care. The brief also poses recommendations for creating a responsive child welfare system for young adults.