In a new study, researchers reaffirm the validity of “blue zones,” regions of the world known for unusually high concentrations of people living long, healthy lives. In recent years, the validity of these regions has been hotly contested; however, this study details decades of demographic research showing that ages in the original blue zones have been validated using the highest standards of modern gerontological demography.
The four original blue zones include: Sardinia, Italy; Okinawa, Japan; Ikaria, Greece; and Nicoya Peninsula, Costa Rica. In the newest study, the authors outline how blue zones research relies on multiple independent documentary sources, including civil birth and death records, church archives, genealogical reconstruction, military and electoral registries, and in-person interviews. Cases that cannot be conclusively validated are excluded.
“These methods were developed precisely because age exaggeration has been common throughout history,” said study co-author Giovanni M. Pes, MD, professor of medicine at the University of Sassari. “Blue zones are not based on self-report. They are based on painstaking cross-checking of records, often going back more than a century. “What we show in this paper is that the original blue zones meet—and often exceed—the strict validation criteria used worldwide to confirm exceptional human longevity.”
Pes and colleagues say these blue zones remain among the most valuable natural laboratories for understanding healthy aging. While genetics may play a role, evidence increasingly points toward lifestyle, diet, physical activity, and social connection as central contributors to long life with low rates of chronic disease.
It’s also worth noting that blue zones are not permanent. Modernization, migration and lifestyle changes can weaken or erase longevity patterns, as seen in Okinawa and parts of Nicoya. Conversely, new candidate blue zones have begun to emerge elsewhere in the world, underscoring the importance of continuous validation.
Data from American Federation for Aging Research