WASHINGTON — When President Biden leaves Tuesday night time for a four-day swing by the Center East, he’ll presumably be extra rested than he would have been had he adopted the unique plan.

The journey was initially tacked onto one other journey final month to Europe, which might have made for an arduous 10-day abroad trek till it grew to become clear to Mr. Biden’s group that such prolonged journey is likely to be unnecessarily taxing for a 79-year-old president, or “loopy,” as one official put it.

Aides additionally cited political and diplomatic causes to reorganize the additional stops as a separate journey weeks later. However the actuality is that managing the schedule of the oldest president in American historical past presents distinct challenges. And as Mr. Biden insists he plans to run for a second time period, his age has more and more develop into an uncomfortable difficulty for him, his group and his occasion.

Only a yr and a half into his first time period, Mr. Biden is already greater than a yr older than Ronald Reagan was on the finish of two phrases. If he mounts one other marketing campaign in 2024, Mr. Biden could be asking the nation to elect a frontrunner who could be 86 on the finish of his tenure, testing the outer boundaries of age and the presidency. Polls present many Individuals think about Mr. Biden too outdated, and a few Democratic strategists don’t suppose he ought to run once more.

It’s, unsurprisingly, a delicate subject within the West Wing. In interviews, some sanctioned by the White Home and a few not, greater than a dozen present and former senior officers and advisers uniformly reported that Mr. Biden remained intellectually engaged, asking good questions at conferences, grilling aides on factors of dispute, calling them late at night time, choosing out that weak level on Web page 14 of a memo and rewriting speeches like his abortion remarks on Friday proper up till the final minute.

However they acknowledged Mr. Biden appears to be like older than only a few years in the past, a political legal responsibility that can not be solved by conventional White Home stratagems like employees shake-ups or new communications plans. His vitality stage, whereas spectacular for a person of his age, shouldn’t be what it was, and a few aides quietly be careful for him. He typically shuffles when he walks, and aides fear he’ll journey on a wire. He stumbles over phrases throughout public occasions, and so they maintain their breath to see if he makes it to the top with no gaffe.

Though White Home officers insist they make no particular lodging the best way Reagan’s group did, privately they attempt to guard Mr. Biden’s weekends in Delaware as a lot as attainable. He’s usually a five- or five-and-a-half-day-a-week president, though he’s referred to as at any hour whatever the day as wanted. He stays out of public view at night time and has taken half in fewer than half as many information conferences or interviews as current predecessors.

When Mr. Biden fell whereas dismounting a bicycle final month, White Home officers ruefully seen that it was among the many prime tales of the week — by no means thoughts that the president works out 5 mornings per week, typically with a bodily coach, or that many males his age hardly experience bikes anymore.

Mr. Biden himself has stated questions on his health are cheap to ask whilst he reassures Individuals that he’s in fine condition. Even for some admirers, although, the query is whether or not that may final six extra years.

“I do really feel it’s inappropriate to hunt that workplace after you’re 80 or in your 80s,” stated David Gergen, a prime adviser to 4 presidents. “I’ve simply turned 80 and I’ve discovered over the past two or three years I believe it could have been unwise for me to attempt to run any group. You’re not fairly as sharp as you as soon as have been.”

Everybody ages in another way, after all, and a few consultants put Mr. Biden in a class of “super-agers” who stay unusually match as they advance in years.

“Proper now, there’s no proof that the age of Biden ought to matter one ounce,” stated S. Jay Olshansky, a long life specialist on the College of Illinois Chicago who studied the candidates’ ages in 2020. “If individuals don’t like his insurance policies, they don’t like what he says, that’s advantageous, they will vote for another person. However it’s obtained nothing to do with how outdated he’s.”

Nonetheless, Professor Olshansky stated it was official to surprise if that may stay so at 86. “That’s the appropriate query to be asking,” he stated. “You may’t sugarcoat growing old. Issues go unsuitable as we grow old and the dangers rise the older we get.”

The White Home rejected the concept Mr. Biden was something aside from a seven-day commander in chief. “President Biden works day by day and since chief executives can carry out their duties from anyplace on the earth, it has lengthy been widespread for them to spend weekends away from the White Home,” Andrew Bates, a deputy press secretary, stated after this text was printed on-line.

The president’s medical report in November indicated he had atrial fibrillation however that it was secure and asymptomatic. Mr. Biden’s “ambulatory gait is perceptibly stiffer and fewer fluid than it was a yr or so in the past,” the report stated, and gastroesophageal reflux causes him to cough and clear his throat, signs that “actually appear to be extra frequent and extra pronounced.”

However general, Dr. Kevin C. O’Connor, the president’s doctor, pronounced him “a wholesome, vigorous 78-year-old male who’s match to efficiently execute the duties of the presidency.”

Questions on Mr. Biden’s health have nonetheless taken a toll on his public standing. In a June survey by Harvard’s Heart for American Political Research and the Harris Ballot, 64 % of voters believed he was displaying that he’s too outdated to be president, together with 60 % of respondents 65 or older.

Mr. Biden’s public appearances have fueled that notion. His speeches might be flat and listless. He generally loses his practice of thought, has bother summoning names or seems momentarily confused. Greater than as soon as, he has promoted Vice President Kamala Harris, calling her “President Harris.” Mr. Biden, who overcame a childhood stutter, stumbles over phrases like “kleptocracy.” He has stated Iranian when he meant Ukrainian and several other instances referred to as Senator Mark Warner, Democrat of Virginia, “John,” complicated him with the late Republican senator of that identify from Virginia.

Republicans and conservative media gleefully spotlight such moments, posting viral movies, generally exaggerated or distorted to make Mr. Biden look even worse. However the White Home has needed to stroll again a few of his ad-libbed feedback, equivalent to when he vowed a army response if China assaults Taiwan or declared that President Vladimir V. Putin “can’t stay in energy” in Russia.

Mr. Biden was famously vulnerable to gaffes whilst a youthful man, and aides level to his marathon conferences with households of mass capturing victims or his working the rope line throughout a visit to Cleveland this previous week as proof of stamina.

Mike Donilon, a senior adviser who started working for Mr. Biden some 40 years in the past, stated he didn’t see any change. “On the best way again from lengthy journeys when the employees is worn out, he’ll need to spend 4 hours planning for the way we hit the bottom working on home coverage, when all a lot youthful employees need to do is sleep,” he stated.

Mr. Biden shouldn’t be the primary president to confront questions of age. The difficulty got here up repeatedly below President Donald J. Trump, who’s 4 years youthful. Mr. Trump’s diminished vocabulary, tendency to meander, generally incoherent remarks, gentle workplace schedule and struggles to course of info led critics to conclude that he was in decline.

Till now, the oldest president was Reagan. When a poor debate efficiency in 1984 briefly threatened his re-election, he recovered in his subsequent encounter by joking that he wouldn’t exploit “my opponent’s youth and inexperience.”

“Reagan understood this difficulty, each intuitively and he had thought it by,” stated the biographer Lou Cannon. “And he advised me, ‘Age can be a problem if I act outdated and it gained’t if I don’t.’”

By Reagan’s ultimate years, a brand new set of aides secretly assessed whether or not he may need to be faraway from workplace below the twenty fifth Modification’s incapacity clause, however finally concluded he was nonetheless match. (5 years after leaving the White Home, he was recognized with Alzheimer’s illness.)

Nonetheless, aides tried to restrict his schedule, monitored sharply by the primary girl, Nancy Reagan. “That’s one of many first classes we had, to not overschedule,” recalled Tom Griscom, a kind of aides. Nor ought to they ship extreme briefing papers at night time. “After a pair weeks,” he stated, “a message got here again down from Mrs. Reagan asking us to not ship a lot up within the night as a result of he would learn all of it,” staying up late.

Mr. Biden’s advisers say he resists such administration and pushes within the different route. “He’s driving additions to his schedule on a regular basis, whether or not it’s new C.E.O. calls or night time conferences with members,” stated Jennifer O’Malley Dillon, the deputy chief of employees who oversees his calendar.

However aides are cautious about exposing him to the coronavirus. Aides are examined as soon as per week and put on coloured wristbands on the day of their take a look at; in the event that they plan to attend a gathering with the president on one other day, then they need to take a look at that morning, too, and put on N95 masks.

The White Home appears equally decided to protect Mr. Biden towards unscripted interactions with the information media. He has held simply 16 information conferences since taking workplace, lower than half as many as Mr. Trump, Barack Obama and George W. Bush had by this stage and fewer than a 3rd as many as Invoice Clinton and George H.W. Bush, in keeping with Martha Joynt Kumar, a longtime scholar of presidential media technique.

Likewise, Mr. Biden has given simply 38 interviews, far fewer than Mr. Trump (116), Mr. Obama (198), the youthful Mr. Bush (71), Mr. Clinton (75) and the older Mr. Bush (86). Mr. Biden has been extra accessible taking a couple of questions informally after a speech or different occasion, which he has carried out 290 instances, in contrast with 213 by Mr. Trump and 64 by Mr. Obama.

Throughout his European journey final month, international leaders adopted his lead whereas protectively treating him like a distinguished aged relative. At a photograph alternative, Chancellor Olaf Scholz of Germany gently pointed Mr. Biden within the route of the cameras. Simply earlier than a gathering, a reporter twice shouted a query about getting grain out of Ukraine. When Mr. Biden couldn’t hear the query, Boris Johnson, the British prime minister, rescued him. “We’re engaged on it,” Mr. Johnson responded.

At instances, Mr. Biden stored a packed schedule. On the day he flew to Madrid for a NATO summit, he met with a number of leaders and completed with a dinner hosted by King Felipe VI and Queen Letizia of Spain. On one other day, although, he skipped night festivities with different leaders, and his public schedule completed with a 3:30 p.m. occasion.

However aides stated he was busy and stayed up working late every night time of the journey out of view — simply as they are saying they anticipate him to within the coming week as he hits the highway once more in Israel and Saudi Arabia.

Jim Tankersley, Michael D. Shear and Katie Benner contributed reporting.