teenagery – teen-age-er-ee adjective
1: having the disposition of a teenager
2: marked by or resulting from having the mindset of a teenager, including but not limited to thoughts of invincibility, selfishness and boredom. Also marked by the innate ability to do something illegal in front of a police officer.
He may be in his 30s, but he sure seems teenagery when he plays that XBOX all damn day.
I always tell my students, don’t get caught doing anything teenagery (like loitering or tagging or smoking if you’re under the legal age) because we won’t get you out of a truancy ticket!