Does the Constitution limit the age at which a juve killer can be tried as an adult?

The question in the title of this post is promopted by this AP story emerging from Pittsburgh sent my way by a helpful reader.  The story is headlined "Boy, 10, Charged As Adult In Death Of 90-Year-Old Woman," and here are the details:

A 10-year-old boy has been charged as an adult in the beating death of a 90-year-old woman over the weekend in northeastern Pennsylvania. Prosecutors in Wayne County said the boy was visiting his grandfather, the caretaker of Helen Novak, in Tyler Hill on Saturday, when county emergency responders got a call reporting her death.

District Attorney Janine Edwards said in a statement that the boy’s mother brought him in to the state police barracks at Honesdale the same afternoon and reported that her son had told her that he had gone into the woman’s room and she yelled at him. The boy told his mother that “he got mad, lost his temper and grabbed a cane and put it around Novak’s throat,” police said. Advised of his rights and interviewed by a trooper, he said he “pulled Novak down on the bed and held the cane on her throat and then punched her numerous times,” authorities said.

State police said the boy told them that he went to his grandfather and told him that the woman was “bleeding from her mouth” but denied he had harmed her, but later told him that he had punched the woman and put a cane around her neck. Police said an autopsy done Monday at Wayne Memorial Hospital in Honesdale indicated blunt force trauma to the victim’s neck, and the death was ruled a homicide....

The boy was charged as an adult with criminal homicide and aggravated assault, with the prosecutor’s office noting that the crime of homicide “is specifically excluded from the juvenile act” and therefore “a juvenile who commits the crime of homicide is charged as an adult.”  The boy was held without bail pending an Oct. 22 preliminary hearing.

I am pretty sure that, prior to the Supreme Court's Eighth Amendment ruling in Miller, this 10-year-old killer would have be facing a mandatory LWOP sentence under Pennsylvania law. Now, I believe, state law provides only a mandatory minimum of 20 or 25 years for this kind of killer. Especially for those still troubled by the Miller ruling and eager to have some juve killers get LWOP sentences (such as folks talking here over at Crime & Consequences), I wonder if they would assert that even a kid still in elementary school could and should never even have a chance to live outside a cage for a crime like this.