It wasn't so long ago that it was referred to as a "second childhood" or simply as senility. Putting aside the life expectancy in India, other forms of research are finding this spice effective.
Curcumin/turmeric is already used in some joint remedies. Right now, I'm taking Dr. Julian Whitaker's Joint Essentials for an arthritic condition in one of my large toes. The capsules contain a deep-yellow-colored powder, which color I assume is due to the turmeric. They seem to be working well BTW, and I'm pretty sure that similar available products would also. The Alzheimer's thing and turmeric is news to me, but I know that some researchers suspect that Alzheimer's is an inflammatory condition that might be helped by anti-inflammatory drugs like Advil or Nuprin.