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An adult who has maintained or adopted a lifestyle associated with young people, especially in matters of fashion, entertainment, and recreation. Also called adultescent.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
an adult who is interested in forms of entertainment such as computer games, television programmes, etc, that are intended for children
aimed at or suitable for kidults, or both children and adults
[C20: from kid1 + (ad)ult]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014