adultescent [ad-uhl-tes-uh nt, uh-duhl‐]
noun
1. a young adult or middle-aged person who has interests, traits, etc., that are usually associated with teenagers.
Also called a·dul·to·les·cent [uh-duhl-tuh-les-uh nt] /əˌdʌl təˈlɛs ənt/, kidult.
See more synonyms on Thesaurus.com
Origin: First recorded in 1995–2000; adult + (adol)escent
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.