early teens
Wasei-eigo from English 'low teen'; refers to the younger teenage years, roughly 13–15. Not used in English with this meaning.
wasei-eigo (Japanese-coined English), from low teen
When I was in my early teens, I played with friends every day.
この雑誌はローティーン向けのファッションを紹介している。
This magazine introduces fashion for early teens.