Abstract
While existing research on regions with high prevalence of centenarians has focused on selected candidate geographical regions, we explore the existence of hotspots in the whole of Denmark.We performed a Kulldorff spatial scan, searching for regions of birth, and of residence at age 71, where an increased percentage of the cohort born 1906-1915 became centenarians. We then compared mortality hazards for these regions to the rest of the country.We found a birth hotspot of 222 centenarians, 1.37 times more than expected, centered on a group of rural islands. Lower mortality hazards from age 71 onwards were confined to those born within the hotspot and persisted over a period of at least 30 years. At age 71, we found two residence-based hotspots of 348 respectively 238 centenarians, 1.46 and 1.44 times the expected numbers. One hotspot, located in high-income suburbs of the Danish capital, seems driven by selective in-migration of low-mortality individuals. The other hotspot seems driven by selective migration and lower morality among those born and residing in the hotspot.Thus, Danish centenarian hotspots do exist. The locations and interpretation depend on whether we look at place of birth or of residence late in life.
Highlights
Those who reach hundred years of age capture our imagination
This study explores whether centenarian hotspots based on place of birth and place of residence late in life exist in Denmark
We found 425,791 still alive and resident in Denmark by age 71
Summary
Those who reach hundred years of age capture our imagination. While the specific number is an arbitrary marker, becoming a centenarian is not a meaningless indicator of longevity, and the interest in geographical regions where a high proportion of people become centenarians has been ongoing at least since the start of the 20th century [1]. For the Nicoya blue zone, it has been observed that the effect is exclusive to those born and resident in the Nicoya www.aging‐us.com region, with a non-significant decrease in mortality among immigrants and no decrease in mortality among out-migrants [5]. This hints at the effect being, in some way, one of physical environment, or at least not tied to cultural factors carried along by out-migrants
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