An octogenarian.
70 - 79 - septuagenarian80 - 89 - octogenarian100 years old - centenarian
A centenarian
An aged person with white hair. The word hoary is also used to describe frost.
A person that stands for equality is called an equal opportunist.
A person Aged 90 to 99 years called a Nonagenarian.
old.
A person aged 100 years is commonly referred to as a centenarian.
old
An octogenarian.
A person aged between 50 and 60 years is often referred to as "middle-aged."
A Nonagenarian
Gax
There isn't a particular name for someone between in 50-60 but someone over 60 is usually called an OAP (Old Aged Person).
tricenarian
Teen.
A Person Between The Ages Of Eighty And Ninety Is Called an Octogenarian. (: