centenarian
Such a person is a centenarian.
A centenarian
A person aged 100 years is commonly referred to as a centenarian.
A person Aged 90 to 99 years called a Nonagenarian.
centurian
A centenarian
Centenarian
old
There isn't a particular name for someone between in 50-60 but someone over 60 is usually called an OAP (Old Aged Person).
A Nonagenarian
A person aged between 90 and 99 is called a nonagenarian.
A person age 60-69 is a sexagenarian, taken from the Latin for "six."