Either you die, or you live long enough for this to be a concern.
Dementia is more prevalent at older ages. About 3% of adults ages 70 to 74 had dementia in 2019, compared with 22% of adults ages 85 to 89 and 33% of adults ages 90 and older.6
And in case you haven't heard, being president tends to speed up the normal effects of aging due to stress.
Biden has spent 12 years in the White House, and half a century in federal politics.
Like, this ain't a binary thing, it accumulates over time pretty much constantly.
And Biden is 100% showing signs that are 100% normal for his age.
I mean, this is the American healthcare system, do you think those numbers are actual rates or more people in their 70s and 80s can't afford treatment anyways and go undiagnosed?
And sundowning is something that happens prior to a dementia diagnosis...
It's literally one of the first warning signs that often goes ignored and rationalized for years or even a decade before diagnosis happens. Lots of times there's never a diagnosis, because we just accept it as normal at that age.