Frontal Sinus Varies With Age (IMAGE) North Carolina State University Caption Forensic anthropology researchers at North Carolina State University have developed a technique that can provide an approximate age for juveniles and young people based on an X-ray of the frontal sinus region of the skull. In this image, the skull on the left shows Stage 1 of frontal sinus development (circled in blue). The central skull shows Stage 2. Stage 3 is on the right. Credit Ann Ross Usage Restrictions Image credit must be given. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.