Because I have spent the time to actually research. I have done the wrinkle mapping.

I wanted to prove whether or not he was real. And I let the forensics determine it, not my own bias. And it showed clearly he is still him.

If you want I will send you my evidence showing beyond reasonable doubt that he is the same Biden he was 40 years ago. Not through assertions but forensic science. I will also show where his face lift scars are, and I will give you and animated gif of his face in a similar angle through his life and how his wrinkle mapping is matching.