An adolescent is someone who is in a stage of life between childhood and adulthood.
If you are an adult and you dream that you are an adolescent once more, you could be going through a period of transition.
Dreaming that you are an adolescent can be a sign that you are ambivalent about taking on new responsibilities.
If you dream that an adult you know has become an adolescent, you may feel that they are irresponsible, or you may feel that they are too serious, and they need to be more relaxed.
Dreaming that you are the parent of an adolescent, when you are not one in waking life, can mean that a project that you have begun is beginning to develop an identity of its own.