Centenarians are people who live to be 100 years old or more. Scientists want to learn more about why some people live so long, so they are doing research into centenarians. They are studying things like the foods people eat, how much exercise they get, how they take care of their bodies, and what habits they have that help them live longer. By learning more about why centenarians live longer, it might be possible to help more people live healthier and longer lives.