An adult in American society

Part I: In your opinion, when do you think a person should be considered an adult in American society? Why?
Are there certain milestones or rituals that determine adulthood, or is it a certain age?
Part II: Discuss your own journey to adulthood. Discuss one or more milestones, rituals, or experiences in your
life that you felt signified your passage into adulthood. How do you think this helped you in the transition