Department of Public Health and Welfare, Population Health Unit, Finnish Institute for Health and Welfare, Helsinki, Finland. Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Solna, Stockholm, Sweden. Institute of Clinical Medicine/Neurology, University of Eastern Finland, Kuopio, Finland. Department of Psychology, University of Cambridge, Cambridge, UK. Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University, Stockholm, Sweden. Ageing Epidemiology Research Unit, School of Public Health, Imperial College London, London, UK. Faculté de Médecine, INSERM-University of Toulouse UMR1295 (CERPOP), Toulouse, France. Department of Epidemiology and Public Health, Toulouse University Hospital, Toulouse, France. Center for Life Course Health Research, University of Oulu, Oulu, Finland. Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland. Neurocenter, Department of Neurology, Kuopio University Hospital, Kuopio, Finland. Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland. Joint municipal authority for North Karelia social and health services (Siun sote), Joensuu, Finland. Finnish Institute of Occupational Health, Helsinki, Finland. Department of Public Health and Welfare, Functioning and Service Needs Unit, Finnish Institute for Health and Welfare, Helsinki, Finland. Department of Social Psychological Sciences, Karlstad University, Karlstad, Sweden. Engineering Psychology, Luleå University of Technology, Luleå, Sweden. Department of Medicine, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland. Department of Public Health, University of Helsinki, Helsinki, Finland. Diabetes Research Group, King Abdulaziz University, Jeddah, Saudi Arabia. South Ostrobothnia Central Hospital, Seinäjoki, Finland. Theme Aging, Karolinska University Hospital, Solna, Sweden.