In most states, a juvenile offender must be at least 16 to be eligible for waiver to adult court. But, in a number of states, minors as young as 13 could be subjected to a waiver petition. And a few states allow children of any age to be tried as adults for certain types of crimes, such as homicide.The current trend among states is to lower the minimum age of eligibility for waiver into adult court.ut, in a number of states, minors as young as 13 could be subjected to a waiver petition. And a few states allow children of any age to be tried as adults for certain types of crimes, such as homicide.