Definition of tween-age in English:

tween-age

(also tweenage, tween age, 'tween-age)

noun

North American
informal
  • A person who is nearly, or has only just become, a teenager. Also (with the): such people as a class. Compare "tween". Now rare.

adjective

North American
informal
  • Of, relating to, or intended for tweenagers.

Origin

1930s; earliest use found in The Sun. Alteration of teenage after 'tween.

Pronunciation

tween-age

/ˈtwiːneɪdʒ/