What is "rejuvenile"

n. (context informal English) An adult whose interests and activities are characteristic of those of children.

Rejuvenile: Kickball, Cartoons, Cupcakes, and the Reinvention of the American Grown-up is a non-fiction book written by author Christopher Noxon and published by Crown Publishing in 2006. The term "rejuvenile" refers to people who "cultivate tastes and mindsets traditionally associated with those younger than themselves."