The Seven Ages is a splendid use of poetic devices by Shakespeare. He describes the life of man in seven stages. He compared the world with a stage and the man as an actor. Read about Shakespeare and then the poem. Useful for the students who want to read this poem. Specially for those who studying in class 9th CBSE. And even if you are not a student and you are not interested in Shakespeare, I think every person should read this poem.
