What is a person aged 90 to 100 called?

A person aged 90 to 100 is commonly referred to as a "nonagenarian" if they are in their 90s, and a "centenarian" if they reach 100 years of age. Nonagenarians are often celebrated for their longevity and rich life experiences, while centenarians are recognized for reaching a significant milestone in aging. Both terms highlight the remarkable nature of aging into advanced years.