All the world's a stage, And all the men and women merely players; They have their exits and their entrances; And one man in his time plays many parts, His acts being seven ages.

This quote means that everyone in the world is like an actor performing on a stage. People come and go throughout their lives, and each person has many different roles that they play like a character in a play. Each role is like a different stage in their life, from infancy to old age.