Some 2.3 million of U.S. adults older than 65 — more than 4% — have a diagnosis of dementia. But even without a diagnosis, a certain amount of cognitive decline is normal as age sets in.

Dementia affects millions of people worldwide, and as our population ages, the number of cases is rising. This condition ...

Time catches all of us eventually. But what if I were to tell you that a new study suggests there’s a simple thing you can do ...