It’s obvious that old Joe has a problem. A BIG problem…

 “When I was watching the debate,” said Dr. Michael Mahler, who’s on the UCLA faculty, “there were clues to me” that Biden, 81, was probably dealing with more than the normal challenges of aging.

The first sign for Mahler was “the way he walked onto the stage, with a very stiff gait. Normally, the way people walk, they swing their arms, and he didn’t have much arm swing. Then, watching and listening to him, he had … almost no facial expression. ... His blink rate was really, really low, and he had very few other movements.”

Mahler noted Biden’s muffled speech as well. He said he couldn’t make a definitive diagnosis without a full physical, lab work, medication history and a five- to six-hour neurological battery of tests. But he said that what he saw were symptoms in the “Parkinsonian” paradigm.

Dr. Jack Florin, a Fullerton neurologist who has been practicing medicine for 50 years, told me he has noticed signs of an advancing movement disorder in Biden for several years, and they were accentuated during the debate.

For Florin, there’s no doubt what’s going on: He thinks Biden has a Parkinson’s variant called progressive supranuclear palsy (PSP). He noted that singer Linda Ronstadt has the same condition, as did the late actor Dudley Moore.

“When you have PSP, your eye movements are not normal,” Florin said. “You’re looking down, and you have difficulty moving your eyes from side to side. People with PSP have what’s called a fixed stare, and it looked like he was just staring, because his eyes were not moving.”

Over the course of his career, Florin said, he’s had hundreds of PSP patients. In Biden, he said, other telling symptoms included “low volume and rapid speech with loss of normal rhythm,” as well as “episodes of sudden forced eye closure,” also known as blepharospasm.

In Biden’s stiff gait, Florin saw another clue.

“He doesn’t have idiopathic Parkinson’s. That’s the most common type. People are stooped, often they have a tremor, and usually it’s on one side more than another. He doesn’t have that,” Florin said.

In his opinion, Biden has PSP, which is “progressive, incurable and untreatable.