This information is by Rick Hasen in Election Law Blog:

Among the findings in this Civics Center report on the 50th anniversary of the passage of the 26th Amendment:

We put enormous effort into creating it, and it has new research that I think your readers will find meaningful.  Here are some key findings:

• • 4 million people turn 18 every year in the US, and the vast majority of them are eligible to register to vote before they graduate high school, but there is little infrastructure in place to actually help them.

Continue reading through this link for the full list of findings and access to the full report.