Who is he?

Biden: Ears, beard, skin, teeth... even the signature is different
Recently, pictures of Joe Biden have surfaced and many are wondering if someone is simply wearing a mask.
The video is a small documentary showing the changes of Joe Biden

Not only does he look completely different, he has different earlobes, a different beard, different skin texture, different teeth, different wrinkles, etc.
But after 30 years, it seems that he has changed his signature
"Who changes their signature after 30 years?"