Just post your ID with your birth date clearly viewable, Yoinkres. That's how you can prove you are not underage.
If you cannot/will not do that, bant users will be in unified agreement to report you to the Board and Site Admins/Jannies for being underage, and that you posted nude images of yourself whilst being underage.
You WILL be permabanned (not just three days), as this information WILL be forwarded to relevant Policing and Legal authorities.
https://www.quora.com/Does-4chan-report-people-to-the-policeAnswer: YES!
Imagine... you will NOT be allowed to post on 4chan ever again... think about that... you will NEVER able to post on bant, ever again... take as long as you need to think of how that would make you feel... but make your choice quickly.
Yonkacabra aka. "Illegal immigrant in USA"; It's why he can't prove his date of birth - he doesn't have a legal ID!