Pick up the pace — walking more quickly could help protect your brain and body from age-related illnesses. MR.Cole_Photographer/Getty Images Power walking could be the key to a long, healthy life, with a lower risk of dementia and disease. New research on "super movers" suggests their longevity secret is keeping a brisk pace after age 80. A neurologist shares how to walk your way to antiaging benefits in as little as 30 minutes a day. As a neurologist, Dr. Joe Verghese is all about finding cre