It is a centenarian
A century means 100 years.
centenary
Centipede
The word you're looking for is "centenary," which refers to a period of one hundred years. It can also denote the 100th anniversary of an event. Additionally, "cent" itself, derived from the Latin "centum," means one hundred.
The prefix cent- derives from the Latin word cent, meaning 100.
In this case, Cent would be the prefix. This comes from the latin word. Cent means 100. A century is 100 years. There need to be 100 cents to equal $1, and 1 Centimeter is equal to a meter. It means 100
cent
centipede
Centennial: of or relating to a hundredth anniversary Centenarian:a person who is 100 or more years old
Cent is a root that means one hundred. There are one hundred cents in a dollar.
birth
Any word starting with "Cent", IE: century, centurion.