RT@QiaochuYuan - "The concept of a teenager basically did not exist until post-WWII. A specific combination of historical forces produced a new class of young people who all had to go to high school, could not work on farms or in mills or factories anymore, and had access to money and cars. The entire rebellious teenager trope was created in this time period so it refers specifically to boomers rebelling against the silent generation, who grew up in a completely different world."
A Brief History of Teenagers | The Saturday Evening Post
Humans have been turning 13 for tens of thousands of years, but only recently did it occur to anybody that the bridge between childhood and adulthood deserved its own name.
saturdayeveningpost.com