Tween
A "tween" was a nickname for an individual "between" child age and teenager.

When Adira Tal (actually age sixteen) was part of the United Earth Defense Force boarding party going through the 's equipment, Lt. Commander Paul Stamets referred to Tal as a "tween menace." ()

Discussing Tal's trust in him, Stamets later told Hugh Culber that he'd never had time to be a "tween's confidante". ()

External link
 
Biology