We must act now before it is too late. Adolescence is a tumultuous time, especially for the youngest, poorest, most marginalized girls. Without the right opportunities, these girls experience too much too soon. They leave school too early; they are married off and become pregnant before they are ready, and have children while children themselves, often at significant risks to their lives. In shocking numbers, they experience violence and harmful practices, are infected by HIV at alarming rates, and join the labor force often under unsafe conditions.