Yes but he must request that his records be sealed. They are not sealed automatically. His probation office can do this for him free of cost but again he must request it.Ask a similar question
In addition, keep in mind that most juvenile records are not available to the general public.
In some counties, the probation officer won't file the petition to seal a juvenile record, but your son can file it himself. The clerk of the juvenile court will have a packet with instructions and all of the necessary forms.