From between and teenage. <span class="searchmatch">tweenage</span> (not comparable) Not yet a teenager (being less than thirteen years old), but starting to act like one. 2007 August...
From <span class="searchmatch">tweenage</span> + -hood. tweenagehood (uncountable) (very rare) The state of being in one's <span class="searchmatch">tweenage</span> years....
From tween + -preneur. tweenpreneur (plural tweenpreneurs) (rare) A <span class="searchmatch">tweenage</span> entrepreneur. 2008, Mariel Perry, Tweenpreneur: The Start-Up Guide To Thinking...