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quinquagenarian

[kwing-kwuh-juh-nair-ee-uh n, kwin-]
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adjective
  1. 50 years of age.
  2. between the ages of 50 and 60.
noun
  1. a person who is 50 years old or whose age is between 50 and 60.

Origin of quinquagenarian

1560–70; < Latin quīnquāgēnāri(us) (see quinquagenary) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for quinquagenarian

quinquagenarian

noun
  1. a person between 50 and 59 years old
adjective
  1. being between 50 and 59 years old
  2. of or relating to a quinquagenarian

Word Origin

C16: from Latin quinquāgēnārius containing fifty, from quinquāgēnī fifty each
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012