[Dr. Sivana]

I think that 40 years is likely more accurate.

Well, maybe if we went with the median age! Keep in mind, even the younger orders have to have some nuns who have been there for a while. That said, I think the average age in our traditional Catholic Church (St. Mary Oratory, Rockford, IL) is about 18, due to all of the newborns. We still have plenty of oldsters.

[Hieronymus]

The liberal orders have few under 80, very few under 70, and many over 80. I would guess an average age of about 80 for one and 40 for the other. As you point out, the median spread is probably even larger, and I would guess reaches 50 years (85 and 35).