This is a complicated question because not all teens talk about their dreams. We know that the brain of the teenager is still growing until they are in their early 20's, so it would suffice to say that their dreams may change as they grow and mature.
A teens's dreams and goals for their future can change based on maturity, their environment and their experiences in school and elsewhere. For example one teen always had the dream of being a doctor, but when she reached high school and took advanced science courses she realized that being a doctor was not for her.
Another instance is someone who always dreamt of being a professional football player but as he grew up he realized it would be more realistic to go to college to be a personal trainer since the chances of being a pro football player were very slim.
You may want to do more research on the subject and let us know what you discover. It could be an interesting article!
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