Joe told the First Lady he didn't feel well.

[Ms. Toad]

47. As I noted - that test is for gross dementia.

I read the article.

Trump passed that test twice. As does my spouse, regularly, despite taking two Alzheimer's medications for more than a decade. That test only rules out significantly advanced dementia

The study participants were self-selected, which means no assumptions can be made about whether the sleep patterns would average out.

The idea that older people tend to have less sleep than younger folks is also nonsense. At 67, I'm sleeping more than I've ever slept. At 92, both of my mother are sleeping more than they ever had - my mother at night; my father spread out over the day and night. Those 3 data points don't prove anything any more than a truism that older people tend to have less sleep than younger people does.

It would certainly be appropriate to include data about amount of sleep in the study - to help sort out more accurate and specific correlations, but the fact is that they used age alone as a stand in for a whole bunch of other factors that are just as likely, if not more, to influence peak mental acuity.