Age for adult criminal prosecution rose from 16 to 18. However, for some extremely serious crimes juveniles may still be tried in adult criminal court.
To be honest, I don't have a strong opinion one way or the other. It seems like anyone who isn't an adult should be tried in a juvenile (or family) court. It is actually less expensive, however, to run someone through adult court/corrections than it is to put them through the juvenile system. In a time when governments are worried most about finances, it can be easier on the coffers to send 16 and 17 year olds to adult court.
Perhaps a simple, single-sentence answer would have done lol. I'll be back to see what the rest of you think about it :)