Even walking more can help with cognitive function as we age; the more exercise you get the more improvement you see. Other tips are listed below like what foods to eat, how to get better sleep, and what supplements to take.
Laura also has several books to read, and online seminars that are very reasonable to attend. My personal favorite is her Earthing book which I highly recommend. Let me know what your favorite is by leaving a comment, and thank you for following me!