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In Coalescing: The Development of Girls’ Studies, Mary Celeste Kearney discusses that in early feminism,in an attempt to demonstrate that women were equal to men, issues about girls were neglected, making it an adult-centered feminism.Thus, feminism became about women, not all females, but there was a need to study girls; they needed to be included.
The fact that the Spice Girls were grown women but their name included the word "girls" instead of "ladies" perhaps, is a sign that they were including all forms of females, not just adults. Their catchphrase was "girl power" and not "woman power" or "female power". Of course, not surprisingly, their majority of their fanbase was comprised of little girls and teenagers (such as myself).