What are the characteristics of early adolescence (10–13 years)?

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That is new to me, thanks so much.

Predominant issues are the new bodily sensations during puberty and a preoccupation with defining a personal normal self. Same sex peers then become all-important for comparison and validation. Opposite sex peers generally become the indicator and litmus tests of success. High levels of physical activity and out-of-the-ordinary behaviours are common. Illness may lead to a distortion of the body image and perceived imperfection leading to isolation from peers. Transitional behaviours often become impulsive and exaggerated. Comparing self with others, real or imagined, may lead to unacknowledged anxieties or moods.