When a child is removed from their home and placed in foster care, society takes over the responsibility for that child's well-being and development. Failure to provide a child with a nurturing upbringing may have negative consequences for the child as well as for society. Using Swedish longitudinal registry data for a national cohort sample of siblings, in which some were placed in foster care and others remained in their birth parents' care, this study asks whether long-term foster care ensures improved life chances. Results from multilevel regression analyses of a wide range of educational, social, and health-related outcomes in mature adult age (16 outcome constructs) support a row of previous studies indicating that traditional long-term foster care does not seem to improve maltreated children's life chances.