No they did NOT.
SCOTUS ruled that in the case of a juvenile criminal the lower courts were not FORCED to issue the minimum punishment or life in prison guidelines mandated by state/federal laws. They still have the option to keep the little punks behind bars for life.
The requirement is youth must be taken into consideration and that individualized sentences are handed down...ie it give the judge/jury latitude in determining whether or not the life sentence without parole is warranted. The offender does not receive the sentence because it is mandated but rather because it is warranted.
After re-reading my post, I am going to clarify, the courts CANNOT give mandated life sentences to minors, but must give individual sentences. The courts CAN give individual life sentences where warranted.