Rushing to Sunset: Hiking in the Himalayas (Young) and Grand Canyon (Old)

In the preface to Rushing to Sunset, the author says, This isnt a book about aging, but it could be. Im anxious about the aging thing... My fear is feeling and acting old... She goes on to describe two extreme physical and mental challenges she undertook at different times in her lifeone when she was young and the other when she was old but felt young. She was twenty-six years old when she agreed to accompany a medical student on a thirty-day, three-hundred-fifty-mile trek to the Base Camp ...