“We notice that the most highly functioning people over 90 in Nicoya have a few common traits,” she told me. “One of them is that they feel a strong sense of service to others or care for their family. We see that as soon as they lose this, the switch goes off. They die very quickly if they don’t feel needed.” Indeed, in every Blue Zone, centenarians possess a strong sense of purpose. In Okinawa it was ikigai—the reason to wake up in the morning. Here, said Fernández, the Costa Ricans called it plan de vida.
