This book explores the consequences of lowering the voting age to 16 from a global perspective, bringing together empirical research from countries where at least some 16-year-olds are able to vote. With the aim to show what really happens when younger people can take part in elections, the authors engage with the key debates on earlier enfranchisement and examine the lead-up to and impact of changes to the voting age in countries across the globe. The book provides the most comprehensive synthesis on this topic, including detailed case studies and broad comparative analyses. It summarizes what can be said about youth political participation and attitudes, and highlights where further research is needed. The findings will be of great interest to researchers working in youth political socialization and engagement, as well as to policymakers, youth workers and activists.