Most teenagers, especially those who graduate from high school with a standard diploma, are at the level of thinking that jean piaget identified as

Formal Operational thinking.

Explanation:

Jean Piaget, a psychologist, developed cognitive development theory which described that as children grow their thinking skills improve and they start thinking more abstractly. In this theory he described that there are four stages of cognitive development in a child:  "Sensorimotor Intelligence", "Preoperational Thinking", "Concrete Operational" and "Formal Operational Thinking".

Sensorimotor Intelligence and Preoperational Thinking develops during the early years of the child starting from birth to around 7 years of age. Then, concrete thinking starts from 7-8 years to 12-13 years of age. According to Jean Piaget, formal operations stage of thinking begins around 11 when the child is able to manipulate things around him and even think more theoretically. This thinking develops over the teenage. Thus, answer is Formal Operational thinking (according to age of children in high school with standard diploma).

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