Nope! In a very recent case rulled upon by the SCOTUS, they ruled that if the murderer was younger than 16 when the murder occurred, then it's "cruel and unusual punnishment" to exectute the murderer, even if that person is in his 20s at the time of the execution.
Mark
In that case, we need to have some hard core conservatives appointed to the SCOTUS. Not that that will ever happen....