The age and birthdate of the real sister Raven was different every time it was referenced:
1. 5-24-80 was the DOB on the application for the drivers license by the impostor Colette.
2. 7-1-80 was the DOB on the info document that Dev found online on his laptop.
3. Sharon told Dev that her sister Raven ran away 27 years ago when Raven was 15 and Sharon was 5, which would make Raven-(the impostor) 42. But if one of the 1980 birthdates from the other two references are correct, she would be 39.