Today’s generation of young people is the largest in history. Over 3 billion people – nearly half of the world’s population –are under the age of 25. Almost 90% of all young people live in developing countries. Young people are a valuable asset to their countries and investing in them brings tremendous social and economic benefits. They also face challenges –including violence and crime, unemployment and HIV/AIDS – that undermine their rights and create significant social and economic costs to society. Read the Manual / Handbook.