[pjc50]

Britain's youngest murderers were about 12. I'm not sure that proves anything.

[petercooper]

10, even :-( https://en.wikipedia.org/wiki/Murder_of_James_Bulger

The prosecution successfully argued against the 'defense of infancy' based on things the kids said themselves admitted they had planned to do to the victim.

[watwut]

Adults kill too and can be more methodical about it. Adults kill more often then children on average.