centenarian

[sen-tn-air-ee-uhn]
adjective
1.
pertaining to or having lived 100 years.
noun
2.
a person who has reached the age of 100.

Origin:
1840–50; < Latin centenāri(us) (see centenary) + -an

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World English Dictionary
centenarian (ˌsɛntɪˈnɛərɪən)
 
n
1.  a person who is at least 100 years old
 
adj
2.  being at least 100 years old
3.  of or relating to a centenarian

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

centenarian
1846 (n.), from L. centenarius "containing a hundred," from centeni "one hundred each," from centum "one hundred" (see hundred). As an adj., recorded from 1849.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was incredibly sprightly and forceful, especially for a centenarian.
Take a close relative of a centenarian and you can put good money on their chances of living a long life.
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