Studying Centenarians (IMAGE) Iowa State University Caption Peter Martin (right), director of Iowa State's gerontology program and a professor of human development and family studies, shares a laugh during a research session with local centenarian John Persinger. Credit Photo by Bob Elbert, ISU News Service Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.