Etymology
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septuagenarian (adj.)

"of age 70, seventy-year-old, between 70 and 80 years old," 1793, from Latin septuagenarius "containing seventy," from septuageni "seventy each," related to septuaginta "seventy" (see Septuagint). The noun meaning "a 70-odd-year-old person, person between 70 and 80 years old" is recorded by 1805. As an adjective, septuagenary "consisting of seventy; pertaining to someone 70-odd-years-old" is recorded from c. 1600.

updated on May 14, 2022

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Definitions of septuagenarian from WordNet

septuagenarian (n.)
someone whose age is in the seventies;
From wordnet.princeton.edu, not affiliated with etymonline.