Why does the poet compare the world with a stage?
The poet compares the world to a stage because he considers all men and women like the actors and actresses in the drama who play role on the stage ie in the world.
Why is the last stage called second childhood?
at the last stage of life, the man slowly loses his vision, hearing, smell, and taste and exits from the roles of his life like a child. therefore the last stage is also called second childhood.