the.com/teenagers
Humans beta-testing adulthood with full confidence and no documentation.
means People aged thirteen to nineteen, caught between childhood and adulthood, brains still under construction.
from From teen, the Old English suffix for numbers ending in -teen, fused with ager in the 1940s as marketers discovered a demographic with allowance money.
Brain buildPrefrontal cortex finishes wiring around age 25.
Sleep shiftTheir body clocks biologically favor late nights.
Recent inventionThe concept barely predates the 20th century.