I found this video where Dr. Bob Berger discusses what is going on in our brain as we age and also what types of cognitive impairments happen. I’m sure we see this in our own lives with grandparents. I think we can better improve our cognition as we get older by exercising and doing brain puzzles. Both my grandparents are in their eighties and my grandma has such a sharp memory (better than me sometimes). Both my grandparents were physically active a few years back and I think that has contributed to my grandparents sharp brain.