NONAGENARIAN
nonagenarian
(adjective) being from 90 to 99 years old; “the nonagenarian inhabitants of the nursing home”
nonagenarian
(noun) someone whose age is in the nineties
Source: WordNet® 3.1
Etymology
Adjective
nonagenarian (not comparable)
Being between the ages of 90 and 99, inclusive. In one's tenth decade.
Of or relating to a nonagenarian.
Noun
nonagenarian (plural nonagenarians)
One who is between the age of 90 and 99, inclusive. One who is in his or her tenth decade.
Coordinate terms
• vicenarian
• tricenarian
• quadragenarian
• quinquagenarian
• sexagenarian
• septuagenarian
• octogenarian
• centenarian
Source: Wiktionary
Non`a*ge*na"ri*an, n. Etym: [L. nonagenarius containing, or
consisting of, ninety, fr. nonageni ninety each; akin to novem nine.]
Definition: A person ninety years old.
Source: Webster’s Unabridged Dictionary 1913 Edition