One Word Substitute

One who is between 80 and 89 years old?
(A) Sexagenarian
(B) Nonagenarian
(C) Septuagenarian
(D) Octogenarian

• Octogenarian is the answer
  
  Here is the entire life line:
  Vicenarian: someone between 20 and 29 years of age
  Tricenarian: someone between 30 and 39 years of age
  Quadragenarian: someone between 40 and 49 years of age
  Quinquagenarian: someone between 50 and 59 years of age
  Sexagenarian: someone between 60 and 69 years of age
  Septuagenarian: someone between 70 and 79 years of age
  Octogenarian: someone between 80 and 89 years of age
  Nonagenarian: someone between 90 and 99 years of age
  Centenarian: someone between 100 and 109 years of age
  Supercentenarian: someone over 110 years of age
• 11 years agoHelpfull: Yes(3) No(0)