[Jamestown1630]

‘Old’ is relative. Some ‘aged’ individuals are very much ‘on the ball’; some of the same age have lost it.

Biden, in his pronouncements and behaviors, has often shown himself to be ‘not entirely there’ - and it’s been going on for quite a while...

[Pontiac]

In a 1995 study performed in East Boston, Massachusetts, all non-institutionalized persons age 65 and older in this community of 32,000 individuals were studied: the prevalence of Alzheimer's disease was 10% of those older than 65 years and 47% among those older than 85 years. Eight percent of people older than 65 and 36% of those older than 85 had cognitive impairment severe enough to limit their ability to live independently.

How Important Is Age as an Alzheimer's Risk Factor? .