Definition of "quinquagenarian" []

• A person 50 years old, or in his or her fifties. (noun)
• Of or characteristic of a person in his or her fifties. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Newsweek resurrected this idea with its cover "Diana at 50," complete with Photoshopped pictures of the quinquagenarian princess in contemporary scenes."
• "There's a curious omission in a New York Times report from Baghdad on the arrest of Samira Ahmed Jassim al-Azzawi, a quinquagenarian woman who goes by the code name "Mother of Believers" and who confessed to Iraqi police that she had recruited at least 28 female suicide bombers for al Qaeda:"
• "The Abbe Pernot was an amiable quinquagenarian, and a 'bon vivant', whose mind inclined more naturally toward the duties of daily life than toward meditation or contemplative studies."