Final answer:
Teenagers are more concerned with issues like world peace and gun violence due to their stage of cognitive development, which allows abstract thinking and understanding of complex, global issues.
Step-by-step explanation:
Promoting world peace:
Teenagers become more concerned with promoting world peace and reducing gun violence compared to younger children because they are in the formal operational stage of cognitive development, according to Piaget's Theory. This stage is characterized by the ability to think abstractly and to consider hypothetical situations, which allows teenagers to conceptualize global issues and imagine potential solutions.
Unlike younger children, who may have more concrete thinking patterns and a limited understanding of the world, teenagers can reason logically and understand complex issues involving politics, religion, and justice. They can debate ideas and have the mental capacity to consider the bigger picture beyond their personal experiences. This cognitive shift also coincides with an increase in processing speed and efficiency during adolescence.