octogenarian [ˌɑ:ktədʒəˈneriən]

例句:

• She is very active for an octogenarian.
  她已经是八旬老人了,还很精神.
  
• She is a very active octogenarian.
  她已经是八旬老人了，还很精神。
  
• I saw a very beautiful old lady, octogenarian person, very unruffled very gentle appearance.
  我看见了一个很美的老太太, 八十多岁的人了, 很安详很慈眉善目的样子.
  
• The position is currently held by another octogenarian revolutionary.
  来自BBC
• This octogenarian's thirst for knowledge is undiminished by age.
  来自VOA
• Some have questioned whether such surgery is appropriate in an octogenarian.
  来自SA