One-hundred years is what we call a century.
You can call anyone who has lived 100 years a Centenarian.
100 years is a "century."
A centenarian is a person who is 100 years old or more. Once they are 110 they are called supercentenarians.
A centenarian is a person who has attained the age of 100 years or more.
It is very rare but there are people who live until 100 years.
100 years is equal to one century.