How can you tell when someone with a warped personality has dementia?
Memory loss Forgetting recent events, Forgetting names, Forgetting where things are, and Losing track of time.
Communication difficulties Difficulty finding words, Difficulty following conversations, Difficulty reading and writing, and Repeating questions.
Planning and organization difficulties Difficulty making decisions, Difficulty solving problems, Difficulty following a series of steps, and Difficulty performing familiar tasks.
Mood and personality changes
Anxiety, Irritability, Sadness, Fear, Loss of interest, Depression, and Paranoia.
Behavioral changes Inappropriate behavior and Agitation.
Dementia is a chronic condition that worsens over time. While there is no cure, medications and therapies can help manage symptoms
He has too many of these symptoms to name. He is certainly irritable and agitated. He's paranoid. He finds insult where none is intended. And he's making really stupid decisions. At what point does he get yanked off the stage?
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he's been acting like a demented dipshit for decades so it's hard to tell 
I'm not sorry any longer. After 59 years of it, I am finally free.
I should have broken off contact with her years ago. It would have been for her own good. No one makes her more angry than I do. I remind her of my father, a man she did not love, but chose to marry to get away from her own mother and father.
She had a shitty childhood. And years later, she failed in her many attempts to pass that anger onto me.
Here I am talking about myself. Fuck that! We got a Trump to deal with.
So far I see roughly the capacity I would expect from a born-wealthy white man of his age who started with a rather pedestrian IQ, a profound, complex personality disorder and the lifelong practice of incurious sloth and gluttony. It’s not impressive, and I wouldn’t expect it to be.
Those who have thought him on the edge of death from dementia, I’m sorry to tell you that you’re mistaken, and believe me, nothing would give me more hope than for his sure and timely demise to be true but alas . . .
Both of his parents showed signs of mental decline before their deaths but from what Mary and Fred Trump have written it doesn’t sound to me like his mother had an Alzheimer’s-type dementia. She sounds like she was a needy, transactional, entitled, manipulative, icy psychopath. She seems to have been ruthless and calculating to the end with her faculties largely intact till the final weeks or months. His father on the other hand seems to have developed a rather classic-style senile dementia and suffered with it for a fairly lengthy period of time.
I saw signs of hope in him showing up with blood-thinner-bruised hands a few months ago, prior to the inauguration. He may have suffered a TIA or minor MI at some point, perhaps with or after Covid. Past is prologue, maybe his disease can progress faster than Mitch McConnell’s.
Truth: You were attempting to imply he has LBD, People have been pointing to pictures of him in high-profile events where he knows he will be highly photographed for about 10 years now and spouting “LBD!!!” CLEARLY, he does not. Again in 2020 the internet was overflowing with remote and promising but superficial diagnosis of every manner of neurological disorders that were certain to result in his complete incapacity and demise at any moment! He was gonna be dead any day now! You may have noticed, it didn’t happen.
You might also notice, he’s never standing that way in candid photos or when he is walking.
It’s the lifts, and his vanity before the cameras, and his insecurity about his weight and height.
https://medium.com/@DrGJackBrown/body-language-analysis-4382-why-is-donald-trump-leaning-forward-29a69fa4e742
I will freely admit I should have been more specific than answering with a simple “no.” That was wrong, I just didn’t have time for any of this. I still don’t. I suppose I should have said “No, leaning forward by itself is not a sign of dementia.” Hopefully everyone would know that anyway. Or more precisely “No, Trump is not standing that way because of a neurological disorder.”