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US life expectancy in 2024 for women was 81.4 years; for men, 76.5 [1]; “non-early” symptoms of Alzheimer's typically begin after 65 [2]. I don’t think that the life expectancy average offset of ~5 years is the main factor here.

1. https://www.cdc.gov/nchs/products/databriefs/db548.htm 2. https://www.mayoclinic.org/diseases-conditions/alzheimers-di...

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No idea what the main factor is. But, it could be a contribution, right? If the life expectancy is ~10 more years after 65 for men, and ~15 for women, then the offset of 5 years seems… somewhat significant?
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The Alzheimer’s association has a good datasheet out for 2026: https://www.alz.org/getmedia/ef8f48f9-ad36-48ea-87f9-b740346...

“Older age is the greatest risk factor for Alzheimers and other dementias, and women live longer than men on average; this survival difference contributes to higher prevalence of Alzheimer's and other dementias in women than in men.

However, it is not clear that the risk of developing Alzheimer's or other dementias differs between men and women of the same age. Most studies of incidence in the United States have found no meaningful difference between men and women in the proportion who develop Alzheimer's or other dementias at any given age. Similarly, some European studies have reported a higher incidence among women at older ages while others have reported higher incidence among men.”

I’ll happily apologize for being in the weeds on incidence vs. prevalence.

The datasheet does have some really interesting info on genetic risk factors such as APOE-e4 and the “strength” of modifiable risk factors such as diet, exercise, and social activity — “In the United States, a study involving more than 375,000 participants estimated that nearly 37% of dementia cases were associated with eight modifiable risk factors”, qtd from the same document linked above

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It also said "comfortable lives".

Also compare retirement ages, years worked, income (hard mental work)... it is well known that alzhaimer is corellated with brain activity (like solving suduku puzzles). Watching tv all day is not very healthy for brain...

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Yes, I didn’t address that portion of your original post, as I was silently agreeing with you that men perform vital social and economic activity such as pick-up truck, football, and bitcoin, whereas women do nothing all day save for frivolous non-labor activities such as raising children.
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Not sure you’re raising children when you’re 65.
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Probably not, but I thought we were discussing all related preventative activities for the full span of the comfortable life.
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Congrats on inventing a Time Machine in the early 80s. Why are you just contacting us now?
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Well, I went out to disprove your thesis, thinking we can easily look at countries where men live longer than women in another country.

For example, women in the US have a lower life expectancy than men in Australia (go figure). Now women are less than 1.4 times more likely than men to get dementia in australia, but about 2 times more likely to get alzheimer in the US. So that kind of points in your direction, but that is of course wildly inaccurate, cause one is mentioning dementia the other only alzheimer and whatnot.

https://www.worldometers.info/demographics/life-expectancy/ https://www.aihw.gov.au/reports/dementia/dementia-in-aus/con... https://www.alz.org/getmedia/ef8f48f9-ad36-48ea-87f9-b740346...

Edit: qwen and glm seem to also agree with parent. "Age is the dominant risk factor".

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Eh, are you citing sone peer-reviewed research or are you making stuff up?
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It is just a bro science, sorry. Correlation and simple statistics is not real scientific method, and does not fit into modern research!
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Then maybe caveat your posts with that
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