I think this is pretty close to being equivalent to asking "how do people turn into adults when they were once children and adolescents?". They grow up. Hormon

I think this is pretty close to being equivalent to asking "how do people turn into adults when they were once children and adolescents?". They grow up. Hormones change, brains develop, lessons are learned, wisdom is gained. The primary reason workplaces tend to be better than high schools is that they are not full of teenagers.