In what State? Because the range is from 13 to 18, and you said "execution." So a 17 year old in an 18 year old State - hang 'em. But a 13 year old in a 13 year old State - have a nice day.
I'll bet you believe 18, 19 & 20 year olds in the military should be arrested for drinking beer before they're 21, too.
This is why juries are allowed to nullify the law itself.
If they are breaking the law, yes.
Do you believe in a nation of laws or do you think we should just make it up and apply it differently depending on whims?