septuagenarian

[sep-choo-uh-juh-nair-ee-uhn, -too-, -tyoo-]
adjective
1.
of the age of 70 years or between 70 and 80 years old.
noun
2.
a septuagenarian person.

Origin:
1705–15; < Latin septuāgēnāri(us) (see septuagenary) + -an

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World English Dictionary
septuagenarian (ˌsɛptjʊədʒɪˈnɛərɪən)
 
n
1.  a person who is from 70 to 79 years old
 
adj
2.  being between 70 and 79 years old
3.  of or relating to a septuagenarian
 
[C18: from Latin septuāgēnārius, from septuāgēnī seventy each, from septuāgintā seventy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

septuagenarian
"seventy-year-old," 1793, from L. septuagenarius "containing seventy," from septuageni "seventy each," related to septuaginta "seventy" (see Septuagint). Noun meaning "a 70-year-old person" first recorded 1805.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They may be the first septuagenarian action figures ever.
So there he was, a portly septuagenarian sunk deep in a leather chair.
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