Who Takes Selfies?

Some of the findings on Selfie City that interested me were on the data page. The majority of people who take selfies are women. In Moscow, there are 4.6 more female taking selfies than male. Another thing that surprised me were that the average age of males taking selfies in each city were older than females. Here in New York, the average age of female taking selfies 24.3, compared to average age of male which is 26.7.  People in Bangkok tend to smile more in their selfies compared to other cities, and it makes me wonder if culture has anything to do with selfie photos.