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A study of Bolotana, a Sardinian village outside the island’s established longevity region, estimated that 13.83% of women aged 70 survived to 100 during 2021–2025. That rate was more than three times the contemporary comparison figures for Sardinia, Nuoro Province and Italy, but the advantage changed substantially in analyses of other periods. Researchers describe Bolotana as a possible blue-zone candidate, not an established longevity hotspot.
Women in Bolotana, a mountain village outside Sardinia’s established longevity region, had an estimated 13.83% chance of surviving from age 70 to 100 during 2021–2025, according to a study published in Frontiers in Aging. The estimate exceeded contemporary comparison rates for the province, island and Italy by more than threefold, but researchers say variation across calendar periods means Bolotana remains a candidate for further study, not a confirmed blue zone.
The research team used civil records and historical parish baptism and burial archives to examine survival among Bolotana residents aged 70 and older. The study covered a village with an average population of 2,266 during the period. The analysis included 3,138 person-years of observation and 149 deaths from 2021 through 2025. The authors say civil birth records were available for every identified centenarian, and parish archives were used to check 97% of recorded centenarian deaths.
For Bolotana women, estimated remaining life expectancy at age 70 was 20.85 years. The corresponding figures used for comparison were 18.61 years in Nuoro Province, 18.40 years in Sardinia and 18.06 years for Italy. 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% nationally.
The study also analyzed men and examined different calendar periods and mortality assumptions. It calculated a separate cohort measure for 3,060 people born in Bolotana from 1900 to 1925, including people who later moved away. The authors compared the results descriptively and did not run formal statistical tests to determine whether differences between the populations were statistically significant.
What Bolotana Adds to Sardinia’s Map
The findings point to a possible concentration of exceptional late-life survival outside the 14 municipalities historically associated with Sardinia’s blue zone. If further research confirms a lasting pattern, Bolotana could broaden the geographic picture researchers use to investigate extreme longevity and the conditions associated with survival into very old age.
The result is also a reminder that a striking local estimate is not, by itself, proof of a stable population-wide advantage. Identifying a longevity hotspot depends on reliable records, appropriate comparisons and evidence that the pattern persists. The authors’ caution matters because Bolotana’s estimated advantage varied markedly by period, and the study did not formally test the differences. The work establishes a research lead, not an explanation for why some residents may live longer.
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How the Sardinian Blue Zone Is Defined
“Blue zone” is a broad label for a geographically defined area with unusually favorable survival into old age and a high frequency of people reaching 100. Sardinia’s historically documented zone comprises 14 mountain municipalities in the Nuoro and Ogliastra areas. Bolotana is about 110 kilometers from that region and was examined to see whether validated local records would show a similarly unusual late-life profile.
Age verification is central to this kind of research: incorrect ages can make longevity appear more common than it is. In Bolotana, investigators cross-checked civil documentation with parish records, then compared life-table estimates with contemporary data from the Italian National Institute of Statistics and the Human Mortality Database. The article also notes that reassessments of other well-known longevity regions have found that historical advantages may weaken over time, as survival improves elsewhere or patterns shift between generations.
“Bolotana is a promising blue-zone candidate rather than an established longevity hotspot.”
— The study authors
Why the Survival Estimate Needs Caution
The study does not establish whether Bolotana’s unusually high female estimate represents a persistent local pattern. The authors found that the estimated advantage changed considerably when they examined other calendar periods, including 2015–2019 and 2020–2025. The supplied study summary does not provide the corresponding detailed results for those sensitivity analyses.
The comparisons were descriptive, with no formal statistical tests of differences between Bolotana and the regional or national populations. The findings also do not identify a cause for the survival pattern or show whether it is linked to lifestyle, health care, social conditions or another factor. The cohort index included people born in Bolotana who later moved away, while the life-table analysis focused on residents; the measures answer different questions and should not be treated as interchangeable.
The report discloses that coauthor Dan Buettner owns Blue Zones, Inc., and that S. Jay Olshansky received consulting compensation related to a proposed Blue Zone Research Institute. Those disclosures are relevant to readers’ assessment of the research; the available material does not establish that they affected the analysis.
Further Checks on Bolotana’s Pattern
The immediate next step is further demographic work to determine whether the high estimate persists across longer periods and larger sets of residents. The authors’ sensitivity analyses already show why a single five-year window may not capture the village’s long-term experience. Follow-up studies could also apply formal statistical comparisons and examine the results alongside carefully validated records from other Sardinian communities.
Until that evidence is available, Bolotana is best described as a promising research candidate. The study does not announce a formal designation, identify a mechanism behind the estimates or establish that the observed advantage will continue. Readers can expect the claim to remain provisional unless later research confirms that the survival pattern is durable and distinguishable from variation in a relatively small population.
Key Questions
What did the study find about women in Bolotana?
For 2021–2025, researchers estimated that 13.83% of women aged 70 in Bolotana survived to age 100. They also estimated remaining life expectancy at age 70 at 20.85 years.
Is Bolotana now officially a blue zone?
No. The authors describe it as a promising candidate, not an established longevity hotspot. The estimate varied across calendar periods, and the study did not formally test differences between populations.
How does Bolotana compare with the rest of Sardinia?
The study’s estimated female survival from age 70 to 100 was 13.83% in Bolotana, compared with 4.43% for Sardinia overall during the cited contemporary comparison. These are descriptive estimates, not results from a formal significance test.
How did researchers check ages in the records?
They cross-validated civil records against historical church baptism and burial records. Civil birth documentation was available for every centenarian identified, and researchers checked 97% of recorded centenarian deaths against parish archives.
What remains unknown?
It is not yet clear whether the female survival advantage is durable, what might explain it, or whether it differs statistically from comparison populations. The study’s reported variation across time periods makes longer-term validation an important next step.
Source: news-medical.net
