"A dozen current and former senior US officials insisted the president “remained intellectually engaged” throughout his presidency as he was asking “smart questions at meetings,” grilling his aides on various points of discussion and rewriting his speeches “right up until the last minute,” NYT chief White House correspondent Peter Baker wrote.

Yet, officials have also admitted that they were “quietly” watching out for him in case of possible issues. The list of potential incidents of concern included the president possibly tripping on a wire or stumbling over words during public speeches."

Biden’s administration also admitted they try to “guard” his weekends in Delaware “as much as possible,” adding that he is mostly a “five- or five-and-a-half-day-a-week president,” even though he can be called “at any hour” if the need arises."