Etymology

teenager

teen·ag·er
T1E1E1N1A1G2E1R1

Today it means: A person between thirteen and nineteen years old (inclusive). Full definition →

English teenage ← Middle English age ← Old French eage
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The story

  1. Proto-Indo-European*déḱm̥
  2. Proto-Germanic*tehun
  3. Proto-West Germanic*tehun
  4. Proto-Indo-European*h₂ey-
  5. Proto-Indo-European*h₂óyu
  6. Proto-Indo-European*h₂oywom
  7. Proto-Italic*aiwom
  8. Proto-Italic*aiwotāts
  9. Latinaetātem
  10. Vulgar Latin*aetāticum
  11. Old Frencheage
  12. Middle Englishage
  13. Englishage
  14. Englishteenage
  15. English todayteenager

From teenage + -er.

Etymology from Wiktionary, CC BY-SA 4.0.