The best phase of a female human's life.
Gets over when she turns 18, or in some cases, 20, or in the majority of the upcoming generation, 12.
When this happens, she has certain constraints on mannerisms typical of being a
stereotypical woman, but are not always present.
Girls are comparatively innocent forms of women.
Girls can be tomboys.
Girls = youth + beauty + innocence +
intelligence + thoughtfulness + generosity + freedomofplayfulness
Of course, even if you're/don't have any of that, but are still classified as girl, you are a girl, girl!