kidult

Someone that, in adulthood, proudly maintains juvenile tendencies. A kidult may be 39, yet still play video games and drink energy drinks, and kick ass at both.

Hells yeah I got the new CoD on my xbox 720*, fool. I'm a kidult after all.

*trying to future proof the sentence

kidult

A person in transition between childhood and adulthood.

"Do you have any ID, you look a little to young to be an adult"

kidults

Term of endearment for one's adult children.

"All three of my kidults are coming over for dinner on Sunday!"

"I hope my kidults start making babies soon---I don't want to be an old granny."