That demo is amusing. I did a Google image search for "N year old faces" for N = 5, 9, 10 and 14, and eliminated results where the accompanying text did not confirm the age, and then gave some of the remaining ones to it. It was always at least 10 years too old on its guess for these children. It got the gender right maybe 3/4 of the time.

I also tried it on a few internet porn images. It looks like it is definitely only relying on the face for determining gender, or it thinks that there are a lot of women with hairy flat chests and large penises...