I've worked with the facegen library in a past life to create faces of various races and ages. They use a statistical model to create faces. There is also a Rus

I've worked with the facegen library in a past life to create faces of various races and ages. They use a statistical model to create faces. There is also a Russian company whose name escapes me atm that also use a statistical model to generate faces. You could approach them to license their data.