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Nearly half of the world’s population, some 3 billion people, is under the age of 25. As the largest generation ever of young people, investments in their health and well-being are crucial so they can make a positive transition into adulthood and fully contribute to the economic and social development of their families, communities and nations. But in order to develop strategies and mobilize financial resources to support adolescent and youth development, decisionmakers need reliable, up-to-date demographic, health, education and socioeconomic data about young people.