1. The actions you should take if you knew that a serious disorder was coming for you will probably be beneficial one way or another.
2. There is nothing you can do about Alzheimers.
3. The only reason you wouldn't live the best, healthiest life you could now is because of an incorrect notion that you'll probably be fine until some set time (e.g. retirement)
Knowing these things, and the fact that stress has a negative effect on your health should compel anyone who reads the article to just live a sustainable life.
Since everyone dies and everyone knows it, the priority should be on living a nice life, free from the illusion that you'll live any given duration. Ideally, being diagnosed with something like Alzheimers would result in a shrug, just like how you would shrug if someone told you you're gonna die one day.