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septuagenarian (adj.)

"of age 70, seventy-year-old," 1793, from Latin septuagenarius "containing seventy," from septuageni "seventy each," related to septuaginta "seventy" (see Septuagint). Noun meaning "a 70-year-old person" first recorded 1805. As an adjective, septuagenary is recorded from c. 1600.

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Definitions of septuagenarian from WordNet

septuagenarian (n.)
someone whose age is in the seventies;
From wordnet.princeton.edu