Editor’s note: CNN Chief Medical Correspondent Dr. Sanjay Gupta and writer Sandee LaMotte are part of the study covered in this story and have written about their experiences. CNN  —  When Penny Ashford’s father was diagnosed with early-stage Alzheimer’s disease at age 62, she knew the devastating brain disorder might one day steal her memory. In her late 50s, her free-floating anxiety turned to outright panic when she began struggling to find words. “I couldn’t tell a story. I couldn’t get my