Life expectancy

Life expectancy is a way of figuring out how long someone is expected to live, like how long it's expected that you'll live. Scientists study how long different groups of people live, and use math to figure out how long people like you are expected to live. They look at things like how healthy people are, what kinds of food they eat, and whether they get enough exercise. By figuring all this out, scientists can give a pretty good estimate of how long people are likely to live. But remember, just because someone is expected to live a certain length of time, doesn't mean that's how long they will live for sure.