Sproutsoul

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Sproutsoul refers to a system member who looks like and/or acts like a teenager, but is not a teenager.

This can be for many reasons, such as, but not limited to, being in a median system, progression, age regression, or having a metaphor-based internal age instead of a development-based internal age.

Sproutsouled members may find it more helpful to be treated as their body's age, or they may prefer being treated as their apparent age. It's recommended to ask them what their preferences are, as it may not always be obvious.

Related Terms
A Oaksoul is a member who looks like and/or acts like an adult, but is not one.

A Seedsoul is a member who looks like and/or acts like a child, but is not one.

Reference
https://the-mare-cognitum.tumblr.com/post/654655107267461120/flags