I have an entire file of Biden pics that span decades that I have examined closely. I am not convinced either way. Comparisons between just a couple of pics is not enough. All of the things you mentioned are not conclusive just given the photographs. In addition, over the years I have worked with patients that have had extensive plastic surgery and they look nothing like their former selves. It does change the ear attachment level, the hairlines, the mouth, etc. Also, when people reach the age Biden is, there can be drastic changes in the face from aging and some people can look very different. Eye color can vary with photos especially someone with hazel colored eyes. Someone's stature can drastically diminish over the years. I have worked with patients that have lost several inches in height and some within just a couple of years. As far as the arm pigmentation, I only saw one photo on the internet making the claim. After examining lots of photos - still not convinced. Just to be fair, we must also take into consideration that all leaders have body doubles which further complicate matters. Therefore, until we can have some other type of evidence beyond just photos that can give more weight that this is a complete switch, everyone is left to make up their own minds on the matter.