1. German Centre of Gerontology, Berlin, Germany;
2. Department of Psychology, & AgeCap, University of Gothenburg, Gothenburg, Sweden;
3. Department of Psychology, University of Umeå, Umeå, Sweden;
4. Department of Psychology, University of Otago, Dunedin, New Zealand;
5. Department of Human Development and Family Studies, Colorado State University, Fort Collins, USA;
6. Department of Psychology, The Ohio State University, Columbus, OH, USA;
7. Department of Psychology, Heriot-Watt University, Edinburgh, UK;
8. Centre for Dementia Prevention, University of Edinburgh, Edinburgh, UK;
9. The Swedish School of Sport and Health Sciences, Stockholm, Sweden