AI-assisted summary

Dementia is a group of brain disorders that cause a decline in cognitive functions like memory and thinking.

While some cognitive decline is a natural part of aging, dementia is an extreme version that is not.

Regular exercise, such as walking 4,000 to 10,000 steps daily, is highly effective in reducing the risk of certain types of dementia.

Mentally engaging activities like puzzles or computer use can also help, but are less effective than physical exercise.

As I approach 80, there is no doubt that I am not as mentally sharp as I was in the past, and the gradual deterioration is obvious when I try to recall names that at one time were very familiar.

I also have to laugh at myself when I enter a room with a purpose, then forget why, or I forget about the lawn spri

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