system
Given the following post, respond as if you're commenting on Reddit:
human
[Inside Out] How do the emotions manage to choose who is the leader of an individual's mind?

Joy seems that is Riley's mind leader; the mother, Sadness; and the father, Anger. This is based on who is in the center most of the time and how they interact each other. There's no doubt that the parents were like Riley as kids, happy the majority of time, but because of experiences or choices up to maturity, somehow, any emotion but Joy took charge in the Headquarters now that they are adults.

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Are the leaders chosen based of how many memories stored during the individual's lifetime? 

Who would be Riley's leader during her teenage years and adulthood?

Are there possibilities that Joy still be the leader during the teenage/adult stage?
gpt
I do not think there is a "leader" emotion, emotions take the control panel depending on which one of them thinks it will be the most useful in a given situation. Over time, one emotion being in charge long enough creates a certain lifestyle for the person they lead, and thus the chosen emotion is needed even more, in a self -feeding cycle.