Macbeth was published in 1623, and William Shakespeare was born in 1564. You do the math! :)
William Brookman was about 15 or 16 when he started bushranging.
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1863585
she started to write when she was about 25 years old
About 28.
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He was in King Duncan's old castle the Macbeth rightfully claim after killing King Duncan, and his sons Malcolm and Donalbain flee the scene and go to England and Israel.
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She is old
You are never too old to write -- many writers started after they retired!
William Shakespeare was in many of his plays as characters with smaller speaking roles but quite important to the plot for example he played the ghost of the old king hamlet in Hamlet and he played Malcom in Macbeth sometimes.