ZURICH, Switzerland (AP):

Evander Holyfield has had his share of doubters over the years, from those who saw him as little more than a beefed-up cruiserweight to others who said he lacked the power to be heavyweight champion.

Now aiming to win the heavyweight title for a record fifth time, the 46-year-old fighter says he has no patience for those who think he's too old or fear he's putting his health at risk.

"They've been calling me old since I was 30 years old," Holyfield said. "When you come up poor, everyone is always doubting you. Someone always tells you that you can't do something. I never listened then, so why in the world would I get into that thinking now?"