What is adolescence population? how is this age grow a very critical stage in a Nation's life?

The adolescence population is basically the youngest people of the population. Not typically people in their twenties or kids who are 5-10 years old. Adolescents are kids who are between the ages of 12 and 17. They are very critical in our nation because we become the next leaders of this country. The adolescent population will grow up to be adults, and soon enough we will take charge in our nation and how we want to run it.