1. Gerontology Research Center and Faculty of Sport and Health Sciences, University of Jyväskylä , Jyväskylä , Finland
2. Department of Behavioral Sciences and Social Medicine, College of Medicine, Florida State University , Tallahassee, FL , USA
3. Department of Geriatrics, College of Medicine, Florida State University , Tallahassee, FL , USA
4. Department of Psychology, Clemson University , Clemson, SC , USA
5. Human Development and Family Studies, The Pennsylvania State University , PA , USA