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A study using validated records found that women aged 70 in Bolotana, Sardinia, had an estimated 13.83% chance of surviving to 100 during 2021–2025, more than three times the comparison rates for Sardinia and Italy. The researchers describe Bolotana as a possible longevity hotspot, not an established blue zone; results varied across time periods, and the comparisons were descriptive rather than formal statistical tests.
A study of Bolotana, Sardinia, found that women aged 70 had an estimated 13.83% chance of reaching 100 during 2021–2025, more than three times the comparison rates for Sardinia and Italy. The researchers say the result makes the mountain village a potential longevity hotspot, but not a confirmed new blue zone: the estimated advantage shifted across time periods, and the population comparisons were descriptive.
Published in Frontiers in Aging, the study examined late-life survival in Bolotana, about 110 kilometers from Sardinia’s established blue zone. Researchers built separate life tables for women and men using civil records and parish archives. They assessed remaining life expectancy at age 70 and the chance of surviving from 70 to 100.
For Bolotana women, estimated remaining life expectancy at age 70 was 20.85 years. The corresponding figures were 18.61 years in Nuoro Province, 18.40 years across Sardinia and 18.06 years nationally. Estimated survival from age 70 to 100 was 13.83% in Bolotana, compared with 4.33% in Nuoro, 4.43% in Sardinia and 3.54% in Italy.
The analysis of residents aged 70 and older covered 3,138 person-years and 149 deaths from 2021 through 2025. Bolotana’s average resident population during that period was 2,266. Researchers said civil birth documentation was available for every identified centenarian and that they checked 97% of recorded centenarian deaths against parish records. They also analyzed a separate cohort of 3,060 people born in the village from 1900 to 1925, including people who later moved away.
Why Bolotana’s Records Matter
The findings point to a possible concentration of exceptional survival among older women outside the Sardinian areas traditionally associated with longevity. If the pattern holds up in further research, it could broaden the geographic picture of late-life survival on the island and help researchers identify where to investigate demographic and historical factors.
The result also illustrates why a striking local estimate is not enough to establish a blue zone. The authors compared Bolotana with regional and national benchmarks but did not conduct formal statistical tests of differences between populations. The available figures describe an unusual signal; they do not establish why it occurred or prove that residents have a lasting survival advantage.
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Beyond Sardinia’s Established Longevity Area
Sardinia’s established blue zone refers to 14 mountain municipalities in the Nuoro and Ogliastra provinces. The region has drawn attention for high rates of extreme old age and a relatively small gap between men’s and women’s longevity compared with many other places. Bolotana lies outside that mapped area, prompting the researchers to test whether validated local records might reveal another pocket of late-life survival.
Age verification is central to such research because errors in recorded ages can distort estimates of centenarian numbers. The Bolotana team cross-checked civil documentation with historical baptismal and burial records. The study’s authors included researchers from Sardinian institutions and US universities. They disclosed that coauthor Dan Buettner owns Blue Zones, Inc., and that S. Jay Olshansky received consulting compensation related to a proposed Blue Zone Research Institute.
“Bolotana is a promising blue-zone candidate rather than an established longevity hotspot.”
— The study authors
How Stable Is the Survival Advantage?
The estimated advantage differed markedly when the researchers examined other calendar periods, including 2020–2025 and 2015–2019. That sensitivity means the 2021–2025 result may not represent a stable, long-running pattern. The source material does not provide the alternative period estimates in detail, so the size and direction of those changes cannot be stated here.
The study does not establish what might account for Bolotana women’s estimate, whether the pattern extends to men, or whether it will persist in later years. Its comparisons were descriptive, and the researchers used simulations and alternative mortality assumptions to examine uncertainty rather than formal tests of population differences. The supplied report also does not give the study’s detailed findings for men or the results of its cohort-based Extreme Longevity Index.
Further Checks on Local Longevity
The study points to the need for further demographic research using validated records and longer time series to determine whether Bolotana’s high female estimate persists. Repeated analyses could clarify how much the result depends on the selected years and how it compares with other Sardinian communities.
No follow-up study or research timetable is specified in the supplied report. Until more evidence is available, the researchers’ framing remains the most accurate: Bolotana is a candidate for further investigation, rather than a newly established blue zone.
Key Questions
Where is Bolotana?
Bolotana is a small mountain community in central Sardinia, about 110 kilometers from the island’s established blue zone.
What did the study find about women’s survival?
For 2021–2025, researchers estimated that a woman aged 70 in Bolotana had a 13.83% chance of reaching 100. The comparison estimates were 4.33% in Nuoro Province, 4.43% in Sardinia and 3.54% in Italy.
Has Bolotana been confirmed as a blue zone?
No. The researchers describe it as a promising candidate. The estimate varied across calendar periods, and the study did not formally test whether differences between populations were statistically significant.
How did researchers check ages in the records?
The team compared civil records with historical parish baptismal and burial archives. Civil birth documents were available for every identified centenarian, and 97% of recorded centenarian deaths were independently checked against parish records.
Does the study explain why survival estimates were high?
No cause is established. The study estimates survival from demographic records; the supplied findings do not identify an explanation for the result or show whether it will continue.
Source: news-medical.net
