An age between child and adulthood - When you are a teenager but still enjoy immature behaviour when around your friends. Also used as title of the famous UK movie.
An individual caught between childhood and adulthood. Often a college student or recent graduate anxious to enter the adult workforce, but is unable to because they still financially depend on their parents or guardians.
Kidults often run into the problem of finding a job at their level: they are overqualified for jobs in retail or fast food, but underqualified to work in most administrative positions."
Peter: "Whole Foods doesn't want me as a cart-boy, but Microsoft requires 3-5 years experience as a computer engineer! What the heck am I supposed to do?"