One way I use to determine the ages of OTMA is the dresses and hair. Their dresses were let down and their hair put up when they turned 16. Their dresses were shorter and their hair was loose when they were 15 or younger. (Everybody probably knows this, but for those who didn't, now you know) This provides me with a basic idea of how old they were. The only time this does not work is with some of those Maria photos from 1914, when she has her hair up for some reason. But that always leaves the dress. (Unless you can't see it in the photo)