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[–]MarkTwainiac[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Demographic changes. More of the population is aged, and aged people are living longer. And the sex and ethnicity of the elderly who are living longer/longest is key too. But I imagine there are many other factors involved too, such as diet, lifestyle, exposure to toxins/heavy metals, rising rates of diseases that cause chronic inflammation...

https://www.cdc.gov/media/releases/2018/p0920-alzheimers-burden-double-2060.html