I noticed the steep decline in my early to mid 40s! I was so worried that I bought a bunch of books on how to improve, but forgot to read them. lol. I even consulted my doctor if I had early signs of dementia.
I attributed it to mushroom coffee that I started drinking, but then I read recently that the shingles vaccine is associated with a significantly lower risk of developing dementia. Maybe not only does it lower the risk, but also improves memory?
Get your shingles vax!