adulthood adulthood /ˈædʌlthood/

noun

1. () The period of time in your life after your physical growth has stopped and you are fully developed  ( adulthood , maturity )
   the period of time in your life after your physical growth has stopped and you are fully developed
     With age comes maturity and wisdom.
   With age comes maturity and wisdom.
   
2. The state (and responsibilities) of a person who has attained maturity  ( adulthood )
   the state (and responsibilities) of a person who has attained maturity