preteen vs tween

preteen

noun
  • A child between approximately 10 and 12 years of age, at the onset of adolescence. 

adj
  • Of, relating to, or designed for, or being children between the ages of approximately 10 and 12. 

tween

noun
  • A child, especially a girl, in the age range between middle childhood and adolescence, normally between eight and thirteen years of age. 

  • An action of tweening (inserting frames for continuity); a sequence of frames generated by tweening. 

  • a number or age in the twenties (plural only), or a person of that age 

verb
  • To generate intermediate frames in an animated sequence so as to give the appearance of smooth movement. 

adj
  • Of or having to do with tweenagers. 

How often have the words preteen and tween occurred in a corpus of books? (source: Google Ngram Viewer )