The Nicoya Blue Zone and Real Estate: What the Research Says, and Where It Applies

The Nicoya Peninsula is on every list of the world's five Blue Zones, and every real estate site on this coast, ours included until this week, has used that to sell houses. The research behind the label is real. It is also older, narrower and less flattering to the property pitch than the brochures suggest. Here is what the studies say, where on the peninsula they apply, and what a buyer can sensibly take from them.

What the researchers found

The longevity work in Nicoya comes mainly from the Costa Rican Longevity and Healthy Aging Study, run by demographer Luis Rosero-Bixby at the University of Costa Rica, and from the Stanford team that has worked with his data. Stanford's summary of that work, published in January 2023, gives the headline figures: average lifespan in Nicoya of 85 years against 77 in the United States, Nicoyans around 60 roughly 29 percent less likely to die in a given year than other Costa Ricans, and Nicoyan men seven times more likely to reach 100 than Japanese men. The biology behind it included longer telomeres in immune cells, about 81 base pairs more than other Costa Ricans, and methylation patterns in the elderly that resembled younger people. A March 2026 preprint from the same data set built region-specific epigenetic clocks from 206 Nicoya residents and 875 other Costa Ricans, so the work is continuing.

The lifestyle explanation has stayed consistent for twenty years. Costa Rica's tourism board describes the zone the way Dan Buettner did: people who eat more plants than meat, a diet built on beans and corn, who get around by walking, with strong family networks and religious practice. It also counts the people: about 45 centenarians, more than 900 residents over 90 and more than 5,000 over 75.

Where the Blue Zone actually is

The tourism board lists the five cantons that make up the zone: Hojancha, Nandayure, Carrillo, Santa Cruz and Nicoya. All five are in Guanacaste province, in the center and north of the peninsula. Cóbano, the district where we work, is in Puntarenas province at the southern tip. Montezuma, Santa Teresa and Cabuya are on the same peninsula as the Blue Zone and they are not inside the area the studies measured.

Rosero-Bixby's own 2023 paper in Demographic Research narrows it further. Tracking cohorts born between 1900 and 1950, he found that Nicoyan men born in 1905 had 33 percent lower adult mortality than other Costa Ricans, while men born in 1945 had 10 percent higher mortality. The advantage, in his words, is vanishing with each generation, and what remains of it is concentrated in a small area from Hojancha inland toward the beach town of Sámara. He told Stanford that people in Nicoya used to reach their 90s routinely and the number is slipping back into the 80s.

So the honest statement is this. The Nicoya Blue Zone was real for people born before about 1930, it is fading for their grandchildren, and its remaining core is an inland corridor sixty to ninety kilometers north of our listings.

What that means if you are buying here

The peninsula is still a good place to grow old. The things the researchers credit, a diet of beans, corn, fruit and fish, daily walking on uneven ground, sun, a small community that knows your name, and low stress, are all available in Montezuma or Cabuya, and they are available because of how these villages are built, with the market a walk away and the car used for the ferry rather than for milk. A buyer who wants those things can have them. What no house here can deliver is the specific genetic and generational effect the studies measured in Hojancha's grandparents.

It also means you should read any listing that trades on the phrase with care. A "Blue Zone home" in Santa Teresa is a home in Santa Teresa. If longevity is the reason for the move, the studied cantons are a different market, served by other agencies, with cheaper land and less coast; the regional MLS covers them and we do not.

The same honesty applies to us. Our older articles claimed a longevity premium on prices here. There is no data for one, and this page replaces two of them.

What the peninsula does offer, on the record

Costa Rica's public health system, the Caja, is open to residents at a contribution of roughly 7 to 11 percent of declared income, which is part of why the country ranks third in International Living's 2026 retirement index, scored on climate and healthcare. On our end of the peninsula the nearest hospital is across the gulf in Puntarenas, two to three hours by road and ferry, which is the fact we put in front of every buyer over sixty before the view. Our retirement comparison sets that against Mexico and Panama, and our guide to living in Montezuma covers the daily life that the Blue Zone research describes, minus the promise.

If you want the peninsula for the way people live here, tell us what your week should look like and we will show you which town fits it. If you want the Blue Zone specifically, we will tell you where it is.

Where these numbers come from

• Stanford Medicine, "Unlocking the secret to longevity in Nicoya," January 23, 2023.
• Rosero-Bixby, "The vanishing advantage of longevity in Nicoya, Costa Rica," Demographic Research vol. 49, 2023.
• Region-specific epigenetic clocks for the Nicoya Blue Zone, medRxiv preprint, March 2026.
• Instituto Costarricense de Turismo, "The secret of Nicoya's Blue Zone"; Blue Zones, Nicoya.
• CRIE, Caja contribution rates; International Living, Global Retirement Index 2026; Naviera Tambor.

Tierra Tropical is a real estate agency in the Cóbano district of Costa Rica's southern Nicoya Peninsula, which lies outside the five cantons the longevity studies cover. Nothing here is medical advice.