George foreman was the oldest at 45, not including Holyfield who won the lightly regarded WBF best at aged 46.
Vitali Klitschko and Jersey Joe Walcott both won the world title at aged 37.
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George Foreman was the oldest boxer to win the heavyweight championship when he knocked out Michael Moorer in the 10th round of a title fight in 1994. Foreman was 45 years old.
At 45 years old, George Foreman. Bernard Hopkins is now 45, and if he wins the lightheavyweight title in december, he will be older than Foreman was.