Evander Holyfield's comeback fight against Vitor Belfort in 2021 serves as a warning for Mike Tyson.
Holyfield, then 58 years old, accepted a fight with the former UFC light-heavyweight champion when Oscar De La Hoya, Belfort's original opponent, was forced to pull out of the contest after contracting COVID-19.
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Like Tyson's upcoming fight against Jake Paul, Holyfield's return to the ring was preceded by widespread medical concerns.
The former two-weight world champion looked like a shell of his former self, slipping early and nearly falling out of the ring.
Holyfield was then wobbled by the first meaningful shot he absorbed - and got knocked down with a left-hand moments later.
Once he got back to his feet, Belfort rained down blows, and although Holyfield covered up, he offered no replies of his own as the referee stopped the fight.
Many had criticised the decision to place a 58-year-old Holyfield in the ring and praised the referee for stepping in so quickly.
However, the boxing legend said: “The guy pushed me, the guy is strong.
“But I wasn't hurt. There wasn't no shot that hurt me real bad. He got me with a shot and I was off balance. I'm not hurt. It's kind of sad.
“I think it was a bad call, he shouldn’t have stopped the fight that quick.”
Now, Tyson is preparing to return to the ring at the same age as Holyfield was when 'The Real Deal' got battered from pillar to post by Belfort.
Except, rather than 'Iron Mike' giving away a 14-year age disparity - as Holyfield did to Belfort - he is stepping into the ring with a man 31 years his junior in Paul.
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The last time Tyson competed - a non-scoring bout against Roy Jones Jr in 2020 - he looked in much better nick than Holyfield.
However, 'RJ' was also in his 50s.
Concerns have been raised about Tyson's health as he gears up to box Paul.
Mike Tyson shows off his power on the pads, but leaves fans concerned as he releases first training footage since Jake Paul fight rescheduled
Senior Lecturer in Medicine at Anglia Ruskin University, Stephen Hughes, recently highlighted the potentially fatal injuries he could sustain if he goes ahead with the bout.
As Tyson is an older man and recovering alcoholic, he is at an increased risk of suffering a subdural haematoma, better known as a brain bleed.
“In older people, the brain tends to lose volume,” Hughes explained. "This lengthens the bridging veins and makes them more vulnerable to rupture.
“Bleeding from these torn veins causes a collection of blood that presses on the brain.
"This causes confusion, loss of consciousness, neurological disability and, in some cases, death...
“Alcoholism is known to accelerate brain shrinkage, and it appears that Tyson has this as a past risk factor.”
Tyson and Paul square off on November 15 at the AT&T Stadium in Arlington, Texas live on Netflix.
Katie Taylor and Amanda Serrano's rematch for the undisputed lightweight titles will serve as the chief support.
Meanwhile, Mario Barrios will defend his WBC welterweight crown against Abel Ramos on the card.
Further down the bill, Indian boxer Neeraj Goyat is set to take on influencer Whindersson Nunes.
