There's likely benefit in staying mentally sharp, but this is true at any age. I'm just a lay person, not a clinician or researcher, but it seems fairly eviden

There's likely benefit in staying mentally sharp, but this is true at any age. I'm just a lay person, not a clinician or researcher, but it seems fairly evident to me that Alzheimer's and similar diseases are the result of: -- Genetics -- Environment -- Lifestyle So while doing puzzles or learning a second language might be good for us overall and ward off some forms of dementia, it doesn't feel like it's going to make much difference in whether we get Alzheimers (or Parkinsons, or Lewy-Body, etc).