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A study of validated records found that women in Bolotana, Sardinia, had an estimated 13.83% chance of surviving from age 70 to 100 during 2021–2025, above comparison rates for Sardinia and Italy. The authors describe the village as a possible longevity hotspot, not an established blue zone, because estimates varied across calendar periods and the comparisons were descriptive.
A study of validated demographic records found that women aged 70 in Bolotana, a mountain village in central Sardinia, had an estimated 13.83% chance of reaching 100 during the 2021–2025 study period. The rate was more than three times the comparison estimates for Sardinia and Italy, leading the researchers to identify Bolotana as a potential longevity hotspot—not a confirmed new blue zone.
Published in Frontiers in Aging, the study examined survival among Bolotana residents aged 70 and older. Researchers built separate life tables for women and men and compared estimates with figures for Nuoro Province, Sardinia and Italy. For women, remaining life expectancy at age 70 was 20.85 years, compared with 18.61 years in Nuoro, 18.40 in Sardinia and 18.06 nationally.
The female estimate for survival from 70 to 100 was 13.83%. The corresponding figures were 4.33% in Nuoro, 4.43% in Sardinia and 3.54% in Italy. These are estimates for the stated study period, not guarantees about an individual’s lifespan. The authors compared populations descriptively and did not conduct formal statistical tests of the differences.
The analysis covered 3,138 person-years of observation and 149 deaths among residents aged 70 and older between 2021 and 2025. Bolotana’s average population during that period was 2,266. To check ages, the team cross-referenced civil records with parish baptism and burial archives. Birth documents were available for every identified centenarian, and researchers independently checked 97% of centenarian deaths against parish records.
A Possible Hotspot, Not a New Blue Zone
The findings suggest that exceptional survival may occur outside Sardinia’s traditionally mapped longevity area, and that careful local records can help identify places worth further study. Bolotana is about 110 kilometers from the 14 municipalities historically associated with Sardinia’s blue zone. The result may broaden research into how late-life survival varies within a region, rather than only between countries or major areas.
But the estimates do not establish why Bolotana’s older women had higher observed survival, or whether the difference reflects a lasting local pattern. The study measured demographic outcomes; it did not test whether diet, activity, social ties, health care or another factor caused them. Its findings are best treated as a research signal requiring replication, not proof that residents have a particular lifestyle advantage or that the village qualifies definitively as a blue zone.
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How Bolotana Differs From Sardinia’s Blue Zone
“Blue zone” is a term used for geographically defined places with unusually favorable survival into old age and relatively high numbers of centenarians. Sardinia’s established example concerns 14 mountain municipalities in the Nuoro and Ogliastra provinces. Bolotana lies beyond that historically identified area, prompting researchers to examine whether another pocket of late-life survival might exist.
Age validation is a central issue in longevity research: errors in records can make a population appear to have more people reaching extreme ages than it actually does. The Bolotana team used civil and parish archives to check centenarian ages and deaths. It also compared its results with contemporary Italian National Institute of Statistics data and Human Mortality Database benchmarks. The researchers ran sensitivity analyses across different periods and mortality assumptions, including 2015–2019 and 2020–2025; the estimated advantage changed markedly between periods.
The paper also reports a cohort-based Extreme Longevity Index for 3,060 people born in Bolotana between 1900 and 1925, including people who later moved away. That cohort measure is distinct from the study’s main estimates for residents observed in 2021–2025 and should not be conflated with them.
“Bolotana is a promising blue-zone candidate rather than an established longevity hotspot.”
— The study authors
Why the Survival Estimate May Shift
The most important uncertainty is whether Bolotana’s high estimate represents a persistent local pattern or a result that depends on the selected years. The researchers’ sensitivity analyses found marked differences across calendar periods, which tempers conclusions drawn from 2021–2025 alone. The source material does not provide the full results for every sensitivity test, so the scale and direction of each shift cannot be detailed here.
The study also reports no formal statistical tests comparing Bolotana with the reference populations. Although record checking supports the accuracy of age data, the findings do not identify causes of survival differences, and it remains unclear whether the estimates will hold in future periods. The study’s disclosed interests also merit consideration: coauthor Dan Buettner owns Blue Zones, Inc., while S. Jay Olshansky received consulting compensation related to a proposed Blue Zone Research Institute.
Further Records and Periods to Check
The next step is to test whether the pattern persists as more years of local records become available and whether it can be reproduced using additional demographic evidence. The study’s authors used sensitivity analyses and historical archives, but the results presented do not settle Bolotana’s status as a longevity hotspot. Replication over time would help distinguish a durable population pattern from a period-specific estimate.
Readers should also look for fuller reporting of the study’s male survival results and its cohort-based Extreme Longevity Index, which are not detailed in the source material provided here. Until further evidence is available, the appropriate conclusion is limited: Bolotana’s women showed unusually high estimated late-life survival in one recent analysis, while the village’s broader standing and the reasons behind the figures remain unresolved.
Key Questions
Where is Bolotana?
Bolotana is a small mountain community in central Sardinia, about 110 kilometers from the area historically identified as Sardinia’s blue zone.
What did the study find about women’s survival?
For 2021–2025, researchers estimated that women aged 70 in Bolotana had a 13.83% chance of surviving to 100. The comparable 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 authors describe it as a promising candidate. Estimates changed across calendar periods, and the study did not formally test whether differences between populations were statistically significant.
How did researchers check the ages in the records?
The team cross-checked civil records against historical parish baptism and burial archives. Civil birth documentation was available for every identified centenarian, and 97% of recorded centenarian deaths were independently checked against parish records.
Does the study explain why women in Bolotana survived longer?
No. It measured survival estimates but did not establish a cause. The available findings do not show whether lifestyle, health care, social conditions or other factors explain the pattern.
Source: rss
