70 - 79 - septuagenarian
80 - 89 - octogenarian
100 years old - centenarian
A person aged between 90 to 100 years is typically referred to as a "nonagenarian." The term specifically denotes individuals in their nineties, and it highlights the advanced age of the person. If someone reaches the age of 100, they are called a "centenarian."
A centenarian
An octogenarian.
A person aged 30-40 years is commonly referred to as a "millennial" if they were born between 1981 and 1996. They may also be part of the "older millennial" or "young Gen X" demographic, depending on their exact birth year. This age group is typically considered to be in early to mid-adulthood, often focusing on career development, family life, and personal growth.
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.
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).