If the assessment were accurate and completely private, I might consider it.
As things stand now, I would not-- and if someone tried to make me submit to such an assessment, I'd hire a lawyer. As a psychotherapist, I have very, very little faith in the reliability of psychological tests.
Unfortunately, neurological and psychological assessment is beset with institutionalized quackery. Some of this results from the inappropriate reliance on randomized clinical trials, which may be the gold standard for medical problems where the endpoint can be accurately measured, but are almost completely useless when you're using self-reporting inventories or answering any kind of a question on a test or assessment instrument.
If your subject is checking answers from a box, guess what? You've introduced a variable you can probably never adequately control for. Maybe you will, probably you won't but you'll never know for sure.
As a species, we just don't know how to assess whether our brains are working properly, which is understandable-- the problem is, we think that we do.
The other problem is, more and more I am hearing about people being diagnosed with Alzheimer's who could not possibly have it. Someone will tell me their mother or grandmother was diagnosed seven years ago, and three years later, they're 86 years old, still driving and taking care of themselves, and only get lost once or twice a year in unfamiliar places and have some occasional trouble with word-finding. That doesn't sound like Alzheimer's to me.
Anecdotally, the best things one can do to avoid dementia: Avoid or abstain from alcohol, don't take any drugs you don't need to take-- particularly SSRIs or antipsychotics-- or smoke anything whatsoever, get regular and serious exercise. If you start becoming really stressed by developmentally normative cognitive decline, just cut back your work load, dump self-blame anywhere you can throw it overboard.
Whatever is making you tremble with stress and rage? It's not worth it.
When my mother's cognitive decline from Parkinson's began to take hold, she ran around the house freaking out trying to find all her files and her keys as she tried to maintain a full case load-- and that's when the dementia got much, much worse. No empirical proof of this, but I've seen variations of this story again and again.