This question has generated a good bit of discussion and controversy recently, mostly centered around the original context in which it was placed. After some rather extended discussion in chat, it seems the OP has agreed to a proper overhaul of the question so that it can achieve its original goals, remain on-topic, and stay reasonably inoffensive to a global audience.
Unfortunately, a proper overhaul would render the existing answer fairly irrelevant. So, how should we proceed with regards to the question?
- Unlock and overhaul the question in-place. The existing answer would also have to be overhauld by the answerer, or it may even be better off deleted.
- Create a new question, based on the proposed overhaul. This way the old Q&A are retained for historical reference, while the re-written question may get a proper answer and provide value to the community.
- Don't bother changing anything. Q&A remain locked and unmodified, and we all just move on.
For reference, here's a rough first draft of the new answer based on what was discussed in chat. (Chat discussion ends around here.)
To what degree can a person's age be accurately determined from images alone?
Let's say you have pictures, or a video, of a person. This media includes views of the person's naked body from practically every angle, from a range of about 3-6 feet. This may include some shots of the person's open mouth and/or exposed genital regions.
Assume that the video and/or pictures are the only information you have. Nothing is known of the subject's medical history or family medical history, and neither the subject nor the family are available for interview, direct physical examination, or testing.
Given that subjects' ages may range from 0 to around 32 years, how accurately can their age be determined from these images alone? Is it possible to achieve accuracy to within one year or less for any or all of these possible ages? What sort of factors would one use to perform such a determination?