It ' s also easier to appeal to a large crowd by doing it in a setting that most of us shared in the past . Of course it ' s never to the extreme anime shows but I ' d say 90 % of targeted audience goes or finished their version of high school . Once you go into the adult world lives can become so different that hardly anything is relatable for another adult . Which in terms makes it harder to appeal to a large crowd . Also teens are mostly more interesting characters than the fair share of adults you meet . Teens say and do dumb things , you watch them mess up and grow , be overly dramatic . If you ' d base it on adults you ' ll get people who are more mature but that doesn ' t mean it ' ll be a more fun experience . Because a fair share of people I ' ve met in my early adult life 23 are people who do what they are asked , stuck in a pattern and don ' t lead very interesting lives . They are content with what they have or not but they don ' t actively try to change it . They don ' t show as much emotion or act overly dramatic . Most series who ' d portray the ' average ' adult life would be rather dull .