> I can’t believe that anyone thinks the brain is somehow the only organ of the human body that does not decline with age
You don't have to believe it. Actually, I happen no to. I'm pretty sure the human liver is remarkably good at regenerating itself and so, as an organ, does not decline stricly with age.
>as for evidence start with the wiki page on this topic
Oddly, you've linked a Wikipedia page whose first sentence is "Age is a major risk factor for most common neurodegenerative diseases" but then you point out that not everyone gets dementia.
So, let's broaden my claim from "dementia" to "neurodegenerative diseases". Absent one of those (what's the prevalence in the population?), how many people decline? Still 100%?
> Once again I can’t believe that people think their boss(es) don’t know how productive they are.
It's tough to tell if you're being disingenuous here or not. Many commenters on here have a remarkable amount (years if not decades) of first-hand experience of working for managers who clearly did not know, in some cases seeing them bamboozled by other employees successfully taking credit for others' work.
These aren't isolated incidents, and it's why there are reasoned, thoughtful discussions on here about what it even means to be productive as an engineer, as well as how to be a good technical manager who encourages the most productivity in the (now well-understood) absence of the ability to measure it.
>While it is not easy and mistakes are often made, it is not difficult to know approximately how productive your reports are.
"Not easy" and "not difficult" are contradictory.
> You have made an extraordinary claim that there are some people that don’t suffer cognitive decline as they age. Are you able to provide any evidence to back up this claim?
Actually, it's you who've made the extraordinary claim, since it requires showing that every single human declines. To falsify it, I need only a single piece of anecdata, which can be pulled from the comments of this thread or the one about IBM's age discrimination.