However, this reading has the disadvantage that in the Folio the length of time Yorick has been in the ground is said to be twenty-three years, meaning that he had been dead seven years by the time Hamlet was born. Another theory offered is that the play was originally written with the view that Hamlet was 16 or 17, but since Shakespeare wrote his plays to be performed, and not read, these lines were likely changed so Burbage (who was almost always the protagonist in Shakespeare's plays) could play the role.