Hmm,yes and I was thinking about a set up where you have to actually give your actual year of birth to sign in this site.
But that can be falsified too.
Only thing I can think of are actual background checking with given email to this site.
For example:
Email address:
[email protected]
After you click on the accept button a message pops up saying:
YOUR EMAIL ADDRESS IS BEING BACKGROUND CHECKED. IF APPOVED,
A LINK TO ENTER WILL BE SENT TO YOUR EMAIL ADDRESS .