centenarian
Someone who is over eighty years old is often referred to as an "octogenarian." This term specifically denotes individuals in the age range of 80 to 89 years old. In more general contexts, they may simply be referred to as elderly or senior citizens.
three hundred and nine years old.
no
10 years old.
old people
A person over a hundred years old is called a centenarian.
Septuagenarian
A sexegenarian.
You can call anyone who has lived 100 years a Centenarian.
Young Adult
septa-centenarian
They would be seventy years old.
She is a hundred years old.
"Centenarian" is usually used for anyone one hundred or older.
A 90 year old is called an nonagenarian. Nonagenarian are people who are over the age of 90 years old.
"Bicentennial" means something that is two hundred years old.
an adult or a 25 year old. it really depends on what the sentence is