Maturity comes with knowledge and other things that you learn during your life (from experience and other sources). So a person might not be considered mature at the age of 14 but they could be more mature than a adult at the age of 18, because they experienced more difficult situations or things like that.
the irony in this is Oh, that we then could come by Caesar's spirit And not dismember Caesar. it's saying that if we dismember caesar his spirit will still be in him but if we kill him his spirit will leave his body
