adultescent

Etymology
.

Noun

 * 1) An adult who continues to participate in and enjoy youth culture.
 * 2) * 1996, Precision Marketing 17 June 21/4 Consider the importance of adultescents to the music biz—they make up over a third of the audience at gigs, but have more cash to spend than teenagers.

Translations

 * Czech: zamrzlý puberťák
 * Portuguese: adultescente