An adult is an adult, and a child is a child.
Whilst SummerRain has a point, babystiing is not truly an adult responsibilty.
If 11/12/13 year olds are to be tried as adults then they must have the same rights and responsibilities as adults. This includes the right to marry, to vote, to drive, to have sex, to buy a house etc. If you would not be comfortable with your 13 year old doing those things, then how can you be okay with them facing adult courts? Lets not forget sitting on the jury as well...30 year olds are hardly the peers of 12 year olds
The brain of a 13 year old is not like the brain of an adult, and brain scans would show you that. I believe the young people of this age have been described as 'brain damaged adults' based on scans. They do not have the maturity and understanding of adults at all, not one 13 year old has the brain of an adult, fact. They should not be tried as adults.
A better system would be IMO locking them up until maybe 25, with mental health treatment if necessary etc then assessing them at that age for release. If they still have murderous thoughts etc they can remain behind bars, if they've changed release them on parole. Case by case basis, no fixed sentences. But no chance of parole at 13 is not right at all :(