According to the article, what are the main reasons for why teenagers rebel?

According to the article, the main reasons for which teenagers rebel varies by age, but generally centers around issues of the child's identity and independence. It usually takes the characteristic of non-conformity rebellion, not being like everyone else, or non-compliance rebellion, not listening to authority. 

In early adolescence (9-13), rebellion is about asserting the child's newfound "adultness" and shedding the child identity of before. 

In later years (13-15), rebellion is usually about distinguishing oneself from the rest, and the child trying to establish his or herself as an individual.

In later years (15-18), rebellion is usually a form of finally separating from parents and the young adult establishing his/herself as an independent adult. It often happens with only children who were slower to separate from the parents.