Are there specific age categories for when the changes can be expected to happen?

In order to examine physical development in adolescence, let's break them down into two main stages. These two stages will focus on early adolescence, which is during the ages of approximately 10-14 for most children, and then late adolescence, occurring during the ages of 15-17. Many professionals are also using the term "emerging adulthood" to extend the period of adolescence into early adulthood, typically the ages of 18-23. This is the result of many American youth delaying adulthood by attending college or vocational schools prior to taking on the responsibilities of adulthood.

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