Adolescents are a very diverse grou

Adolescents are a very diverse group.
A boy of 12 is very different from a young man of 19.
A boy of 12 is also very different - physically but also psychologically from a girl of the same age.
A boy of 12 who is part of a caring and financially secure family is growing up in very different circumstances from another of the same age who has run away from home to escape physical violence.
Two boys of 12 who are growing up in very similar conditions may develop in very different ways.
All these categories of adolescents have different needs; different but also changing needs.