nonagenarian Meaning, Definition & Usage

  1. noun someone whose age is in the nineties
  2. adjective satellite being from 90 to 99 years old
    • the nonagenarian inhabitants of the nursing home

WordNet

Non`a*ge*na"ri*an noun
Etymology
L. nonagenarius containing, or consisting of, ninety, fr. nonageni ninety each; akin to novem nine.
Definitions
  1. A person ninety years old.

Webster 1913