I am an elementary teacher, and I was considering giving them to a 6th grade student. So, a 12 year old sized face!
They were narrow (I fall into average head measurements, and they were tight), and the lenses were small. They would probably look best on an oblong or square face (according to the "fit profile".
According to the product specs tab:
Frame fit: Small
Lens coverage: Medium
Temple to temple: 4-3/4"