Unless the arrow of causality is the other way: those that would tend to develop memory problems do not become or remain as Taxi drivers.

Not strange when you realize thinking is also physical.

Wouldn’t thinking be like exercise for the mind? And we know what happens to people that don’t exercise

Perhaps specific types of thinking cause somewhat sustained brain activity during waking hours that mitigates adverse physical changes leading to Alzheimer’s.

The opposite of this is how sleep and unconsciousness allows the brain to perform cerebrospinal fluid transfer based maintenance routines via the glymphatic system, and why sleep is important to neural health.

https://www.science.org/content/article/scientists-uncover-h...