Noun
tweenhood (uncountable)
tweendom
Mainly, the more faddish and newer stages of life are really just marketing schemes. Tweenhood. The young old. The quarter-life crisis. Jill Lepore
Stages of life are artifacts. Adolescence is a useful contrivance, midlife is a moving target, senior citizens are an interest group, and tweenhood is just plain made up. Jill Lepore