nonagenarian

adjective

1. of the age of 90 years, or between 90 and 100 years old.

noun

2. a nonagenarian person.

noun

1. a person who is from 90 to 99 years old

adjective

2. of, relating to, or denoting a nonagenarian

n.1776, coined in English with -an + Latin nonagenarius “containing ninety” (in Late Latin “someone ninety years old”), from nonagen “ninety each,” related to nonaginta “the number ninety,” from nonus “ninth” (see nones) + -genaria “ten times,” from PIE *dkm-ta-, from *dekm- “ten” (see ten). As an adjective from 1893.