Boy are you ever right. I'm 82, still relatively alert, fit and active for my age, no health problems, no meds, and I could not possibly acquit myself well in a high pressure job like that.
You're lucky to still be in such good health at 82... imagine the stresses of doing that job for a person who's not in great health or is experiencing some mental slipping at that age.
If PubMed/NIH longitudinal numbers are any indicator:
(22.2%) in the United States age 71 years or older had cognitive impairment without dementia. Prominent subtypes included prodromal Alzheimer disease (8.2%) and cerebrovascular disease (5.7%). Among participants who completed follow-up assessments, 11.7% with cognitive impairment without dementia progressed to dementia annually.
When you consider that 1/3 of the Senate and 1/5 of the House of Reps are over that age... The idea that statistically 22% of them are experiencing decline that could progress to dementia is more than just a little concerning.
I realize however, that those folks may not line up with the general population as conventional wisdom would dictate that an election process itself is a sort of "weeding out" of people who are in that state. Although, at that age, a lot can change in the duration of a Senate term.
Then there's also the other metabolic and cardiovascular issues are that all too prevalent among Americans that are over the age of 65.
I don't even understand the mentality behind wanting to the job at that age in the first place. Most of them have healthy bank accounts... they have to really love power in order to keep doing that job as opposed to retiring and enjoying their golden years. My plan is to retire at 58, not work, and focus on doing some traveling (provided the market doesn't take a major dump in the next 15 years)
If one had millions and millions of dollars, insisted on staying in a job until they're 85 where it's nothing but nonsense and half of the country hating them, and then died 18 months later (as opposed to hanging up the hat 65 and enjoying those last 20 years), what a waste.