Centenarians are individuals who have reached the age of 100 years or older. This group is often studied in the fields of gerontology and demography to understand the factors contributing to longevity. Many centenarians exhibit unique lifestyle habits, such as healthy diets and regular physical activity, which may play a role in their extended lifespan. The number of centenarians has been increasing globally, partly due to advancements in healthcare and improved living conditions. Regions known for high concentrations of centenarians, such as Okinawa in Japan and Sardinia in Italy, are often referred to as "Blue Zones," where people live significantly longer than average.