Many people – from fellow boxing legends to current boxers, pundits and media personalities and even fans – are against Mike Tyson fighting Jake Paul. Why? Because of his age.

Tyson, once the most feared boxer in the world, celebrated his most recent birthday on June 30. He was born in 1966, making him 58 years old ahead of Friday’s Netflix event at the Dallas Cowboys’ AT&T Stadium in Arlington, Texas.

Even Joe Rogan, as big as he is, came out fighting Tyson – although the UFC commentator and popular podcast host can understand why the former heavyweight champion is doing it.

“I wish it was nothing,” Rogan said during an episode of “The Joe Rogan Experience” in September. “I wish it wasn’t something where a 58-year-old man would fight a (much younger man). That said, I fully support his desire to do it. What, will he live forever? No, he won’t live forever. Maybe he wants another chance. Maybe his body can handle one more fight. Don’t know.”

Age difference between Paul and Tyson

Paul was born on January 17, 1997, which makes him 27. In other words: Tyson becomes 31 years older then Paul as they enter the ring.

By the time Paul was born, Tyson had 47 professional fights to his name. Tyson became the youngest heavyweight champion at age 20 when he defeated Trevor Berbick via TKO on November 22, 1986, more than 10 years before Paul was born. Tyson’s shocking loss to Buster Douglas took place on February 11, 1990, almost seven years before Paul was born. Paul still wasn’t born before Tyson’s first fight with Evander Holyfield on November 9, 1996, and was just 5 months old when Tyson infamously bit Holyfield’s ear during their rematch.

Mike Tyson’s health problems

In addition to Tyson’s age, there are concerns about his overall health heading into the fight with Paul. The original fight date earlier this year had to be scrapped after Tyson experienced a medical scare on board a plane due to a stomach ulcer. Since then, Tyson’s health and overall condition have come under scrutiny. His agent, Andrew Ruf, was forced to quell fears of a knee injury last month after Tyson was seen in a training video wearing a compression garment.

All things considered, it’s no wonder so many prominent people are against Tyson getting back in the ring.

For more information on the fight, visit MMA Junkie’s hub for Paul vs. Tyson.

This article originally appeared on MMA Junkie: How old is Mike Tyson? A lot older than Jake Paul