Not sure if its a record, but Walter Edgerton Ko'ed someone at the age of 63, i don't know of anyone who has won older.
Do you know of any closeted ***** champs? Griffith wasn't so open that calling him ***** wouldn't send him into an uncontrollable rage. This is for you and Unitas both: First ***** champ to kill an opponent - Emile Griffith
1st former champion to bite ear off in a fight with a lisp and is on anti-depressants,weed,and coke......Mike Tyson
1st fighter to get taken out of a rehab for a fight and have a melt down in the ring......Oliver Mcall