What is adulthood?

Adulthood is stated as the time period in the human lifetime where they have achieved all the physical and psychological maturity of life. In simple language, adulthood is the time period from 20-21 years, which is then followed by the middle age that is 40s and the oldies comes under 60 years. In this journey of the person, he/she experiences all ups and downs, failures and success of their lives.