There are 1.2 billion adolescents (10-19 years old) worldwide today and this number will rise through 2050. Nearly nine out of ten adolescents live in low- and middle-income countries. The health and well-being of adolescents now and in their adult lives greatly depend on key opportunities for education, skill development, employability, access to quality health services and a supportive environment that can help them stay healthy, empowered, embracing gender equality norms and demanding rights.