teens

teens
    n 1: the time of life between the ages of 12 and 20
    2: all the numbers that end in -teen
    

Teens \Teens\, n. pl. [See {Ten}.]
   The years of one's age having the termination -teen,
   beginning with thirteen and ending with nineteen; as, a girl
   in her teens.
   [1913 Webster]
    

53 Moby Thesaurus words for "teens":
      L, Sexagesima, awkward age, boxcar, boxcars, dozen, duodecimo,
      eighty, eleven, fifteen, fifty, five and twenty, fortnight, forty,
      four and twenty, fourscore, fourscore and ten, fourteen,
      half a hundred, long dozen, ninety, nonagenarian, octogenarian,
      quindecennial, quindecim, quindecima, quindene, score,
      septuagenarian, seventy, sexagenarian, sexagenary,
      sexagesimo-quarto, sixteen, sixteenmo, sixty, sixty-four,
      sixty-fourmo, teen age, thirteen, thirty-two, thirty-twomo,
      threescore, threescore and ten, twelve, twelvemo, twenty,
      twenty-five, twenty-four, twenty-fourmo, two dozen, two weeks,
      twoscore