Adults tend to be more stable when it comes to personality and decision making, whereas adolescents and children tend to be more erratic and fluctuating, because of what?

Experience

Explanation:

There is a saying that's common around us, which is "experience is the best teacher". Although this is not applicable for all scenario's of life but it seems to have a big role in most life events. The reason why an adult gas an edge in decision making over an adolescent is that the adult while being in the same age category made mistakes and now understand which choices of life are better than the other and knows the outcome from many choices the adolescent would be faced with.

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