A 28-year-old male skeleton is recovered from a flood-affected area in Bihar. Examination reveals that the epiphyses of the long bones (humerus, femur, tibia) are fully fused, the iliac crest is completely ossified, and the vertebral bodies show no fusion. The first and second molars are fully erupted with minimal wear, but the third molars are absent (not congenitally missing—sockets are open). What is the most appropriate next step in refining the age estimate?