I'm sure there are a few of them:
Archie Moore for scoring the most ko's of any champion.
Thomas Hearns for being the first boxer to win titles in 5 weight classes.
Oscar De La Hoya for being the first to win 6.
Manny Pacquiao for being the first to 7.
Henry Armstrong for being the first to hold titles in 3 weight classes simultaneously.
Mike Tyson hold the record for the youngest heavyweight champion of the world at 20 years, 4 months and 22 days old
Aaron Pryor finished his boxing career with a 39-1 record.
He is world record holder in the Icosathlon, the double decathlon.
He is a lightweight boxer from England who holds the world record for mosr professional boxing matches.
He holds the title for Middle Weight Boxing Champion of The World.
79 pencils is the world record.
Australians hold the world record for the highest gas reserves per capita.
Boxing-Scoop.com has a amateur boxing records database.
ali or balboa
it depends on what the record is, but usually there isn't an age limit
5
He retired at 49-0, a record that held until 2017 when Mayweather beat Connor Magregor to bring him to 50-0.