Comment by randcraw

Yes, I think that's right. The average age of death due to old age has climbed for over a century, probably due to greatly improved public health and personal medicine.

https://ourworldindata.org/life-expectancy

Because dementia and other neurodegenerative diseases take decades to manifest they've been especially hard to diagnose early and prevent or treat early, while cognition is still intact. Alas, I think that hasn't changed much in recent years, despite many scientists and businesses working toward that end.

Partly that's because few academic researchers can pursue a theory long enough in time to fully assess its potential, especially in combo therapies. Nor can the big pharma corporations who not only suffer from the same difficulty in long-term funding, but prefer the ROI of continuing treatments for disease to that of quick cures (or lifestyle advice). These are nowhere near as profitable a pill the patient must take for decades.