Memory loss and senility are concerns as one reaches the "senior" years. As there is mental illness in my family, including 2 elders who "cracked up" in their last few years, and my grandmother lived for a couple of decades without short-term memory, these problems are on my mind as I age.
How to prevent or at least reduce the chance or impacts of such afflictions? I found good advice under the heading of "Preventing Alzheimer's" on the helpguide.org website. Here is the link to the article. (Sorry, there is some mechanism preventing me from copying the article and pasting it here.)