Where is banquo when he is murdered?

Banquo was of unknown age at the time of his death. William Shakespeare [Baptized April 26, 1564-April 23, 1616] gave few details in his play 'Macbeth'. Additionally, Banquo most likely was a made-up character. But if he had been real, and undoubtedly for the purposes of the play, he most likely would have been of the same age as friend and fellow General Macbeth [c. 1014-August 15, 1057]. The information as to Macbeth's precise birthdate hasn't survived the passing of time. His birth has been guesstimated as having occurred as early as 1005 and as late as 1014. According to the play, Banquo didn't die too long after King Duncan I [c. 1005-August 14, 1040]. He supposedly had a son, Fleance. So dates of 1005-1040 would have made him around 35 years old.