The road to adulthood is not a smooth ride. Becoming an adult is a process of learning experiences. It requires mistakes to be made, lessons to be learned, and deep introspection. Despite these roadblocks young adulthood is, in my opinion, a more favorable time than is full maturity.
Most young adults are responsible only for themselves.
The typical young adult is a single status person. Thus, they are free from the duties that accompany married life. Also, most young adults are not parents at this point of their lives. They do not have to worry about feeding or clothing a young child. Having no dependents, they are free to basically do as they please.