Did they have birth certificates in Sudan in 1953?
I'd be more concerned about the lies on his resume that deal with jobs and degrees rather than the birth date.
Our son's race was mistakenly entered into a school computer as African American. The school receptionist/secretary got three of our other children right, but our fifth grader keeps getting male for African American-related events for the school district. When the mistake was caught, the receptionist/secretary contacted the main office of the school district. Supposedly, they have fixed the error, but we continue to receive fliers for AA events. The receptionist/secretary told me that the LAW is that you can only change your race once. lol
If it becomes a problem, you aren't changing his race, you are correcting their mistake.