Do We Have This One?
In Real Life
hair rarely shows how mature you are. In fiction, hair length is an easy way to tell a persons experience.
You'll see a male teenager or kid with long hair, or maybe an afro even. A few years down the line, maybe a child later, and he'll be clean cut.
Likewise for girls.
Between Intergenerational Friendship
's, or maybe even relatives or friends with a few years difference, the older one will often have short hair and the youngest a longer length.
In older fiction, with girls at least, this was quite often Inverted
. Short hair was a sign of immaturity, sometimes a Tomboy
too, while long hair was more mature and feminine