Old dude shouldn't go to jail for this. Give him some fine, sure.
Just so he knows you can't just kill someone and have no cost or consequences for it.
He should not given fines, or any sort of punishment.
If you wake up on the wrong side of the bed one day, should you be given fines?
If a drunk driver decides to crash into your car, should you be given fines because a drunk driver made a choice to ruin your life?
Welcome to the almighty all powerful state and their sick and warped sense of justice and morality.
https://www.youtube.com/watch?v=CSvFpBOe8eY&list=RDEMRoCx7NEN4B1lXoHSAiz26w&start_radio=1