And I don't see evidence of dementia or any cognitive dysfunction. I see a man of average or slightly lower than average intelligence.

But when I compare his current verbal and communicative skills with examples from about 20-30 years ago,(Youtube is full of them) I see a loss of about 20 or thirty points of IQ. He used to be a lot sharper and quicker than he is now.

Much the same can be said about Joe Biden. He's certainly not the same man he was in his 50s and 60s, but his age-related changes have manifested themselves in his ability to respond quickly and adapt to a rapidly shifting conversation. He still has all his smarts, but he's just not as fast and flexible, or as confident, as he used to be.

Contrast both these men with Bernie Sanders, also about the same age. You may not agree with what he says or thinks, but Bernie is still as sharp as a tack. He doesn't miss a thing.

I'm about Trump's age, and I've certainly noticed a drop in my own mental capacity over the same time period, its only natural. But my own loss of cognitive function is nowhere near as extreme as his. If I were in his shoes, and experiencing the same symptoms, I would have gone for professional help a long time ago. My own natural mental deterioration due to age might disqualify me from being President (that's always a subjective call), but it would not prevent me from recognizing that, or prevent me from admitting it to others and doing something about it.

I may be an old fart, but I understand that well enough to make allowances for it.