Just a quick thought which came to my mind while I read one of the recent threads (guess which one).
Do you think there is someone who lies about his/her gender (probably not many cases), age (higher frequency here - there is probably a lot of confused children here) and in consequence about theirs deeds?
Ask here such person to create a quick video with them... It's not about showing your ugly faces here which could lead to your identification, they should be covered in some way.
But a quick predetermined phrase they would have to say and some hand gesture with it should be sufficient to identify gender and approximate age.
