2008 there were nearly 500 kids in PA serving life in prison

http://www.post-gazette.com/pg/08273/915905-85.stm

Acording To the gazette in 2008 there were nearly 500 kids in PA serving life in prison
for crimes committed as juveniles and some convicted by the felony murder rule.
Which is that even though they were not personally responcable for the murder
they were convicted also.