CNN looks at 39 killings for which 14-year-olds were convicted . `` What 's the definition of a child ? '' asked Justice Stephen Breyer . The high court in under age 18 banned the death penalty for killers 2005 .
The Supreme Court looks at two killings for which 14-year-olds were convicted . `` What 's the definition of a child ? '' asked Justice Samuel Alito . The high court in 2005 banned the death penalty for killers under age 18 .