Are you getting the error message about your son's birthday on a PowerSchool Registration/InfoSnap form, or is it coming from another product?
If it's coming from PowerSchool Registration/InfoSnap, you will need to reach out to your school district to make sure they have the correct birth date set up for your son in their student information system.
Thank you for your post! Your school would be your best resource to help with this. We have a most commonly asked questions article here and it shares when to reach out to your school and how to reach out to support:
If you need our help with reaching out to support, please let us know.