Stuart A. Schneck, M.D., a professor emeritus of neurology, University of Colorado School of Medicine, has long been interested in medical problems associated with aging. He has been hiking with his wife Ida for more than forty-six years - in Colorado and around the world. Ida I. Nakashima, M.D., an associate professor emeritus of pediatrics, University of Colorado School of Medicine. She has been hiking with her husband Stuart for more than forty-six years - in Colorado and around the world.