the word "teenage" is a modern english compound, first recorded in the early 20th century. it is formed by combining "teen", a clipped form derived from the "-teen" suffix found in the numbers thirteen to nineteen, with the noun "age", signifying a period of life. the "-teen" element itself originates from the old english word for "ten", reflecting that these years are the ones ending with "-teen". thus, "teenage" literally denotes the "age" spanning from thirteen to nineteen, a period defined by its concluding "teen" years.

Structure: teen (ten) + age (period of life) - teen: from old english tēne, tīen, meaning "ten". in english, the numbers thirteen to nineteen end with "-teen", indicating "ten more than" the base number. - age: from old french aage, eage, ultimately from latin aetāticum (age, period of life). it denotes a state, condition, or period of time.