The SwCS aimed to describe a population of Centenarians living in Sweden from physical, social, and psychological points of view, to characterise centenarians with various health conditions and diverse degrees of autonomy and life satisfaction, and to identify factors at 100 years that predict future survival. Between 1987 and 1991, the study recruited 100 centenarians living in southern Sweden from the National Register and 86 close relatives. Centenarians completed a baseline assessment within 6 months after their 100th birthday, and were followed to assess survival from the age of 100 to the death of the entire cohort, with the longest follow-up until age 111 years.