A centenarian
An octogenarian.
Not sure about rotating an octogen (a person aged between 80 and 90 years) but an octagon can have rotational symmetry of order 0, 2, 4 or 8.
400 years ago. In other words, subtract the current year, minus 400.Note: So far, no person is known to have lived more than about 110 or 120 years.
The director of the Braemar home for the aged is Jeff Stewart who is seventy six years old and has been the director of this home for over thirty five years.
A person aged between 50 and 60 years is often referred to as "middle-aged."
tricenarian
Teen.
A Person Between The Ages Of Eighty And Ninety Is Called an Octogenarian. (:
A person Aged 90 to 99 years called a Nonagenarian.
A person between the ages of 40 and 49 is a quadragenarian.
A person aged between 60 and 70 years is typically referred to as a senior citizen or someone in their senior years.
A person aged 100 years is commonly referred to as a centenarian.
old
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).