Yes, Costa Rica is home to one of the world’s five designated Blue Zones, regions where people live measurably longer than average. The specific area is the Nicoya Peninsula, a stretch of land on the country’s Pacific coast spanning five cantons: Carrillo, Santa Cruz, Nicoya, Hojancha, and most of Nandayure. The designation is based not on how many centenarians live there at any one time, but on life expectancy: an adult in a Blue Zone has an unusually high probability of reaching age 90 or 100.
That said, the Nicoya longevity advantage is more complicated than it first appears. Recent demographic research shows the effect is fading, and some scientists question whether Blue Zone data worldwide is as reliable as it seems.
What Made Nicoya Stand Out
The original research focused on Nicoyan men, and the numbers were striking. Males born before 1930 had adult mortality rates 33% lower than other Costa Ricans. A survival study tracking over 16,300 elderly Costa Ricans between 1990 and 2011 found that Nicoyan men had a death rate roughly 20% lower than men elsewhere in the country. That advantage was statistically explained almost entirely by lower cardiovascular mortality.
Interestingly, the longevity benefit did not appear in women, and it disappeared when men emigrated from the peninsula. Something about living in Nicoya itself, not just being born there, seemed to matter.
The Nicoyan Diet
The traditional Nicoyan diet centers on rice, beans, and moderate amounts of animal protein. It’s high in fiber and has a low glycemic index, meaning it doesn’t cause sharp spikes in blood sugar. Centenarians studied in the region consumed dairy products one to three times a day and ate meat three to five times a week, with pork being the most common, though portions stayed small.
This isn’t a vegetarian or restrictive diet. It’s a simple, consistent one built around affordable staple foods that happen to be good for cardiovascular health.
Mineral-Rich Water
One factor unique to Nicoya is the mineral content of the drinking water. A study of 59 districts across the peninsula measured total water hardness (calcium carbonate plus magnesium carbonate) and found a positive correlation with longevity. Districts with harder, more mineral-rich water had higher rates of people surviving into their 80s and 90s. Both calcium and magnesium play direct roles in bone density and heart rhythm, and drinking mineralized water over a lifetime appears to act as a protective factor.
Plan de Vida: A Reason to Get Up
Nicoyans talk about “plan de vida,” or “life plan,” a concept that translates loosely to having a positive reason to live. Jorge Vindas, founder of the Nicoya Blue Zone Association, describes simplicity and optimism as its core features. The goal isn’t to reach a specific age. It’s to find reasons to enjoy tomorrow. As Vindas puts it, “If they plant an orange tree at 90, they plan on eating the fruit.”
For many centenarians in the region, daily purpose looks modest: walking to visit family, tending crops, riding a horse. Most live with relatives and are respected as sources of wisdom, which gives them a social role that deepens rather than fades with age. As residents grow older, many find their motivation in teaching skills to younger generations, keeping the Nicoyan way of life going.
The Longevity Advantage Is Shrinking
More recent research complicates the Blue Zone story considerably. A 2023 study published in Demographic Research found that the Nicoyan longevity advantage has largely vanished for men born after 1930. While males born in 1905 had mortality rates 33% lower than other Costa Ricans, those born in 1945 actually had mortality rates 10% higher. The geographic hotspot of exceptional longevity has contracted to a small corridor from the inland town of Hojancha to the beach town of Sámara.
The likely explanation is modernization. As processed food, sedentary lifestyles, and urbanization reached the peninsula, the conditions that produced exceptional longevity eroded. The surviving centenarians are genuine outliers, but the pipeline behind them looks increasingly ordinary.
Questions About Blue Zone Data
A broader critique applies to all Blue Zones, not just Nicoya. Researcher Saul Justin Newman has pointed out troubling patterns in extreme-age records worldwide. In the United States, supercentenarian status (living past 110) is predicted by the absence of birth registration, not by good health infrastructure. When states introduced birth certificates, supercentenarian records dropped by 69 to 82%. Only 18% of “exhaustively validated” supercentenarians have a birth certificate at all, and their recorded birthdates cluster on dates divisible by five, a hallmark of estimated rather than actual records.
Newman also found that Blue Zones in Sardinia, Okinawa, and Ikaria corresponded to regions with lower incomes, lower literacy, higher crime, and shorter average life expectancy compared to their national averages. These are exactly the conditions where record-keeping is weakest, raising the possibility that some portion of extreme longevity claims reflect clerical errors or pension fraud rather than genuine survival.
This doesn’t mean the Nicoyan lifestyle factors are irrelevant. Low cardiovascular mortality among older Nicoyan men is well documented through follow-up studies, not just age records. But it does mean the most dramatic claims about centenarian clusters deserve some skepticism.
What’s Real and What’s Overstated
The Nicoya Peninsula is a real Blue Zone in the sense that older men there, particularly those born in the early 20th century, lived significantly longer than expected. The contributing factors are plausible and well-studied: a fiber-rich, low-glycemic diet, mineral-dense water, strong family integration, physical activity built into daily life, and a cultural framework that gives elders purpose and respect.
What’s overstated is the idea that Nicoya remains an exceptional longevity hotspot today. The advantage has narrowed dramatically across generations, and the geographic area where it persists has shrunk to a fraction of the original five cantons. Costa Rica as a whole has excellent life expectancy for its income level, but the specific Blue Zone magic appears to be a product of a particular generation living under particular conditions that no longer fully exist.