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A study using validated civil and parish records found that women in Bolotana, Sardinia, had unusually high estimated survival from age 70 to 100 during 2021–2025. The result exceeded comparison rates for Sardinia and Italy, but the advantage varied across calendar periods, and researchers say Bolotana is a candidate for further study, not an established blue zone.
A demographic study of Bolotana, a mountain village in Sardinia, found that women had unusually high estimated survival from age 70 to 100 during 2021–2025, compared with regional and national rates. The researchers said the findings make Bolotana a potential longevity hotspot, but changing estimates across time periods mean it is not yet established as a new blue zone.
Published in the journal Frontiers in Aging, the study used civil records and parish archives to examine late-life survival in a community about 110 kilometers from Sardinia’s historically recognized blue zone. Researchers estimated women’s remaining life expectancy at age 70 at 20.85 years. The comparable figures were 18.61 years in Nuoro Province, 18.40 in Sardinia and 18.06 across Italy.
The estimated share of Bolotana women surviving from age 70 to age 100 was 13.83%. The study’s comparison figures were 4.33% for Nuoro, 4.43% for Sardinia and 3.54% for Italy. Those are estimates for the stated study period, not a forecast for an individual or proof that the same advantage holds across generations.
For the main analysis, the team recorded 3,138 person-years of observation and 149 deaths among residents aged 70 and older from 2021 through 2025. Bolotana’s average population during those years was 2,266. The researchers also calculated a separate cohort-based measure using 3,060 people born there between 1900 and 1925, including people who later moved away.
A Possible Longevity Pocket Outside Nuoro
The findings matter because they suggest that exceptional survival in Sardinia may not be confined to the 14 municipalities traditionally identified as the island’s blue zone. If the pattern is sustained and verified across longer periods, Bolotana could give researchers another community in which to investigate how survival at older ages varies by place and population.
But the study measures a demographic pattern; it does not identify its cause. It cannot establish that local diet, social ties, physical activity, health care or any other factor produced the estimates. Nor does it show that residents elsewhere can reproduce the result. The work is a starting point for further population research, not evidence of a guaranteed route to longer life.
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How Researchers Checked Bolotana’s Records
Blue zones are places described as having unusually favorable survival into old age and relatively high numbers of centenarians. Sardinia’s established longevity region lies in the island’s mountainous interior, across communities in Nuoro and Ogliastra. Researchers have cautioned that claims of exceptional longevity need reliable age documentation, since errors in reported ages can distort comparisons.
To check ages in Bolotana, the researchers cross-referenced civil documentation with historical church baptism and burial records. They reported that birth documentation was available for every identified centenarian and that 97% of recorded centenarian deaths were independently checked against parish archives. The analysis also compared Bolotana descriptively with contemporary figures published by Italy’s National Institute of Statistics and with Human Mortality Database benchmarks. The authors did not perform formal statistical tests comparing the populations.
The researchers tested different mortality assumptions and calendar windows, including 2015–2019 and 2020–2025, alongside the primary 2021–2025 analysis. Their work was conducted by researchers from Sardinian institutions and universities in the United States. The authors 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
Why the Survival Advantage Needs Testing
The results do not show whether Bolotana’s apparent advantage is stable. The researchers’ temporal sensitivity analyses found that estimates differed markedly between periods, so the 2021–2025 figures may not describe a long-running local pattern. The available summary does not provide all period-specific estimates or explain which factors account for the variation.
There are other limits. The study’s comparisons were descriptive, without formal tests of whether differences between Bolotana and the regional or national populations were statistically significant. Although the record checks strengthen age validation, the observed deaths and person-years cover a small community and a limited recent window. The findings also do not establish why survival estimates were higher among women; the study’s headline result is specific to women, and should not be generalized to Bolotana men.
The cohort measure covers people born in Bolotana over 1900–1925, including those who left, while the life-table analysis concerns residents observed in 2021–2025. These measures address different groups and cannot by themselves show whether growing up in Bolotana caused longer survival. The study identifies a pattern for investigation, not a causal explanation.
Longer Records Could Clarify the Pattern
The next step is to test whether Bolotana’s estimated survival advantage persists in additional years and across different cohorts, using the same careful record validation. Further comparisons could help determine whether the recent figures reflect a durable local pattern, variation in a small population, or differences linked to the particular years analyzed.
The study does not announce a formal designation of Bolotana as a blue zone or set a timetable for one. Until longer-term evidence and further analysis are available, its status remains that of a candidate community for demographic research.
Key Questions
What did the study find about Bolotana women?
For 2021–2025, researchers estimated that 13.83% of women aged 70 in Bolotana would survive to age 100 under the study’s life-table analysis. The estimate was higher than the comparison figures reported for Nuoro Province, Sardinia and Italy.
Has Bolotana been declared a new blue zone?
No. The authors describe it as a promising candidate, not an established blue zone. The estimated advantage varied across the calendar periods researchers tested.
How did researchers check reported ages?
They compared civil records with historical parish baptism and burial records. The study says birth documentation was available for every identified centenarian and that 97% of recorded centenarian deaths were checked against parish archives.
Does the study explain why women survived longer?
No. It reports a difference in estimated survival but does not establish what caused it. The results do not prove that diet, lifestyle, social conditions or another factor explains the pattern.
How large was the main analysis?
The analysis covered 3,138 person-years and 149 deaths among residents aged 70 and older from 2021 to 2025. The village’s average population during that period was 2,266.
Source: news-medical.net
