I know this is silly, but I uploaded one of my pictures to the "How Old Am I" iPhone app and I was surprised by how "accurate" it guessed my gender and age... lol - I'm 45, btw.. :)
(https://www.susans.org/proxy.php?request=http%3A%2F%2Fi1378.photobucket.com%2Falbums%2Fah85%2Fjessisondelli%2FIMG_0749_zpswhna78xc.png&hash=01ac129a90238dd1bb49e9766345e676021fb140)