Merriam-webster.com defines septuagenarian as “a person whose age in the seventies”. That would, obviously, include people who are age 70 through 79. It’s a pretty big word but I suppose if a person has managed to live to be that old, they deserve an impressive sounding noun to describe them.
Like so many of our other English words, septuagenarian is derived from Latin. In this case, the etymology or origin of the word comes from the 8th century Latin septuagenarius, (based on septuageni ‘seventy’).
A person who is aged between 70 and 79, is referred to as a septuagenarian. There are many other terms that are associated with people belonging to a particular age group usually above 70. This is because life after 70 years of age is considered as a lengthy one.
Similar to a Septuagenarian, an octogenarian is a person who is aged in between 80 and 80 years of age. On the other hand, a person who is aged in between 90 to 99 years of age is referred to as a nonagenarian. These people are referred to as senior citizens in common language.
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