In Act I scene 1 of As You Like It, how and why is Duke Senior compared to Robin Hood?

You need to turn towards the end of this first scene to
discover this reference and explore why it is used. Having been shamed and beaten by his
brother, Orlando, Oliver then talks to Charles about what has happened in court. Charles
tells him (and us as the audience) how Duke Senior was banished from his rightful
position of leader by his younger brother, Duke Ferdinand, and how he has set up court
in the Forest of Arden with some of his loyal friends that have deserted their positions
of influence in the court to be with Duke Senior. Note how Charles describes
them:

They say
he is already in the Forst of Arden and a many merry men with him, and there they live
like the old Robin Hood of England. They say many young gentleman flock to him every day
and fleet the time carelessly as they did in the golden
world.

Duke Senior is
compared to Robin Hood in the way that he lives in the forest in opposition to the
authority that is based in the court. In addition, he is said to be enjoying life and
passing time "carelessly" as they did in the "golden world," harking back to a time of
innocence and diversion when people were able to live lives free from the toil and
strain of work and effort.