Mike Tyson, 58, shows off his ripped physique during weigh-in for Jake Paul fight

Mike Tyson looked to have barely aged as he flaunted his physique ahead of his blockbuster showdown against Jake Paul this week. 

The 58-year-old former world heavyweight champion will make his highly-anticipated return to the ring Friday when he faces YouTuber-turned-boxer Paul at the home of the Dallas Cowboys in Texas. 

The boxing legend, who is 31 years older than his rival, may be heading into the bout the underdog, but he looked as fit as ever when he stepped on to the scales Thursday. 

Iron Mike looked to be in incredible shape at Thursday's weigh-in, not looking too far off the physical peak of his glory days. 

Both Tyson and 27-year-old Paul stepped on the scales - around 36 hours before they'll face off in Texas - but it is currently unclear how much the two fighters weighed. 

Tyson, previously branded 'The Baddest Man On The Planet,' has sparked concerns among fans over stepping into the ring with Paul at the age of 58 after he suffered a medical emergency during a flight earlier this year.

He revealed earlier this month that he threw up blood before passing out during a medical emergency in May.

Tyson said he became nauseous and dizzy on a flight from Miami to Los Angeles, forcing airline staff to ask passengers if there was a doctor on board.

Paramedics later boarded the plane to treat Tyson after it had touched down in Los Angeles - with Iron Mike stating he was 'defecating tar'. 

Tyson was taken straight to hospital and treated by a series of doctors, who refused to rule out of the possibility of death, according to Iron Mike. 

During Netflix 's docu-series in the build up to Tyson's fight with Paul, the 58-year-old explained how the doctors had found a two and a half inch ulcer.

The fight was due to take place in July, but that incident forced them to postpone proceedings.

Paul also looked to be in fighting form as the 10-1 boxer showed off his inked torso. 

The former YouTube star is a -200 betting favorite with BetMGM Sportsbook. Tyson, meanwhile, is as wide as +1000 to win on points.

But the odds don't faze the 58-year-old, who was asked this week how he feels about carrying the underdog tag.

'I'm fine with everything - I'm fine with everything,' Tyson said. 'I will not lose.'

Iron Mike was speaking at the final pre-fight press conference on Wednesday, when Paul gambled his entire purse with Katie Taylor that he will beat Tyson.

Paul is said to be in line for a $40m (£31m) payday from Friday's clash, the biggest purse of his career.

On Wednesday, the undercard fighters were asked to pick who would win the main event, with the majority tipping Tyson.

When challenged over her pick, Irish icon Taylor - who faces Amanda Serrano in the co-main event - asked Paul: 'Do you want to bet your purse?'

Paul responded: 'Yeah, let's bet the purse. Deal.'

The controversial fight, which is being streamed live on Netflix, is being held at AT&T Stadium in Texas.