Definition of "teens"

teens

/tiːnz/

noun
1. plural of teen
noun
plural only
1. The numbers between thirteen and nineteen.
2. The time of life between thirteen and nineteen years old; the teenage years.
3. The second decade of a century: the 1910s, 2010s, etc. The oneties, the tens.
  Quotations
  2010, Michael G Cunningham, “The 20th Century's aughts and teens: OPERETTA”, in Gilded Songs (Berlin to Bacharach): The Gig Instrumentalist's Guide to the Golden Era of American Popular Song (1920 to 1979)
4. (temperature, rates, plural only) The range between 10 and 19.