70 - 79 - septuagenarian
80 - 89 - octogenarian
100 years old - centenarian
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.
A person aged 50-59 is typically referred to as a middle-aged adult. This age range is often considered part of the broader category of middle adulthood, which generally spans from about 40 to 65 years old. In some contexts, individuals in this age group may also be described as "pre-retirement" or "older adults," depending on the focus of the discussion.
A person between the age of 40 and 50 is commonly referred to as middle-aged. This stage of life is often characterized by various social, psychological, and physical changes. Individuals in this age range may experience shifts in career, family dynamics, and health considerations.
There isn't a particular name for someone between in 50-60 but someone over 60 is usually called an OAP (Old Aged Person).
Teen.
tricenarian
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 age 60-69 is a sexagenarian, taken from the Latin for "six."
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).