What does the word octogenarian mean?

Usage examples for octogenarian

  1. But Peter Ernest, when his son was not there to superintend his operations, was nothing but a testy octogenarian, while the two together were not equal to the little finger of Farnese, whom Philip would have displaced, had he not fortunately died. – History of the United Netherlands, 1594 by John Lothrop Motley
  2. The old man- an apostolic looking octogenarian- is sitting right over there where the jury can see him. – Courts and Criminals by Arthur Train