The Collaborative International Dictionary
Septuagenary
Septuagenary \Sep`tu*ag"e*na*ry\, a. [L. septuagenarius, fr. septuageny seventy each; akin to septuaginta seventy, septem seven. See Seven.] Consisting of seventy; also, seventy years old. -- n. A septuagenarian.
Wiktionary
septuagenary
a. Consisting of seventy; seventy years old. n. A septuagenarian.