 My prediction, according to this neurosurgeon, is that the president will have increasing troubles walking over the next six months, eventually needing some sort of assistive device. His dementia will probably advance during that time as well. We are not seeing the same Joe Biden of even a year ago. This is an educated guess on my part, but I've spoken to many colleagues who feel the same way about his appearance. His gait and his expressionless face, called a poker face in Parkinson's literature, are quite classic.