Suppose someone asks you to prove that a man in a mountain village is 102 years old. The man has no papers in his pocket. He says he was born in the village, in a year he remembers because of a flood.
Suppose you are asked to name the places where people live the longest. A list of five comes to mind for many people. A 2025 review looked at what the research says.
Suppose you could ask a 100-year-old in each of four places how a day goes. What would you expect to hear? Dan Buettner and his team did something like this.
Suppose two people are 60. Each is told to expect about 23 more years. One may spend most of them in full health. The other may not. Life expectancy says how long.