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Adjective: nonagenarian  ,nó-nu-ju'neh-ree-un
  1. Being from 90 to 99 years old
    "the nonagenarian inhabitants of the nursing home"
Noun: nonagenarian  ,nó-nu-ju'neh-ree-un
  1. Someone whose age is in the nineties

Derived forms: nonagenarians

See also: old

Type of: golden ager [N. Amer, informal], old person, oldster [N. Amer, informal], senior citizen