Claim the voting age should be lowered to 16. Which source would provide information that is most relevant to that claim

One source that would provide information relevant to the claim that the voting age should be lowered to 16 is a report or study that assesses the political knowledge, maturity, and civic engagement of 16-year-olds. Additionally, sources that analyze countries or regions where the voting age has been lowered to 16, and evaluate the impact on youth turnout, political participation, and long-term civic engagement, would also be relevant.