Authors:

The higher mental activities are pretty tough and resilient, but it is a devastating experience if the drive does stop. Some people lose it in their forties and can only stop. In England they are a source of Vice-Chancellors.

John Edensor Littlewood, Béla Bollobás (1986). “Littlewood's Miscellany”, p.196, Cambridge University Press
The higher mental activities are pretty tough and resilient, but it is a devastating experience if the drive does stop. Some people lose it in their forties and can only stop. In England they are a source of