The reading list

This page gathers research about growing older, and only that: how much strength, sharpness and appetite for life people keep through their seventies and eighties, and how much difference sleep, purpose and sustained attention make to all three.

None of it is research about this practice, and the two are kept apart on purpose. The studies say what these years can hold. She says the rest.

Any research this site leans on lives here, with its method in view. The pages themselves quote almost none of it — by choice.