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> From autopsy studies:
> 
> https://www.newscientist.com/article/2340560-superagers-with-sharp-memories-in-their-80s-have-larger-neurons/
> 
> “'Superagers” – people aged 80 or over with exceptionally good memories – may have larger than expected neurons in a region of the brain that is critical for memory.
> 
> "With age, most people experience a gradual decline to their memory, but some maintain a remarkable ability to recall past events into their eighties or older, on par with people 20 to 30 years younger.
> 
> "Alongside a decline in memory, our brains naturally shrink with age, with previous studies suggesting this occurs less with superagers.
> 
> "Now, researchers have shown that superagers may have larger than expected neurons in their entorhinal cortex, a component of the brain’s memory system.
> 
> ***
> 
> "Among the superagers, their entorhinal cortex neurons were around 10 per cent larger than those of the people who died at a similar age with a to-be-expected memory.
> 
> "The superagers’ neurons were even around 5 per cent larger than the people who died 40 years younger, suggesting that larger than average neurons may contribute to an exceptional memory at age 80 or over.
> 
> "The superagers also had substantially fewer protein clumps called tau tangles inside their neurons than their counterparts who died at a similar age. An abnormal build-up of tau has been suggested as a cause of Alzheimer’s disease.
> 
> “'I am not yet sure why larger neurons are associated with preserved memory other than that they are more resistant to tau tangles,” says Gefen. “One other hypothesis is that they are more structurally sound and can generate more optimal [neural connections].”
> 
> “'[The overall study] adds to the growing evidence that superagers differ from typical adults on multiple levels of the brain,” says Alexandra Touroutoglou at Harvard Medical School.
> 
> “'The sample size here is relatively small, but that’s understandable. Superagers are a rare group, so finding a good number of them in a postmortem brain study is difficult,“ she says."
> 
> Comment: All I can say is a very interesting study.