What term is used to describe individuals aged 100 to 109 years?

The term used to describe individuals aged 100 to 109 years is "centenarians." This classification comes from the Latin word “centum,” meaning one hundred. Centenarians are a subset of the elderly population and indicate a significant milestone in lifespan and longevity, reflecting advancements in healthcare, nutrition, and overall living conditions that can contribute to an increased life expectancy.

In contrast, "supercentenarians" refers specifically to individuals who are 110 years old or older, indicating an even more extraordinary longevity. Terms like "old-old" and "young-old" generally categorize older adults based on age but do not specifically designate individuals who have reached the centenarian milestone. The "young-old" typically refers to those aged 65 to 74, while the "old-old" refers to those aged 75 and above. Thus, the distinction is clearly established with the term centenarians for those aged 100 to 109.