Evander Holyfield is just a few weeks shy of his 57th birthday ... but he's still ready to throw down -- and will fly to Japan for a charity exhibition in 2020.
Holyfield hasn't fought professionally since May 2011 (he beat Brian Nielsen) -- but "The Real Deal" says he's kept himself in prime shape ever since and he's ready to get back in the ring.
The details about the exhibition fight are unclear but Holyfield says he still thinks he's got the at signature knockout power.
Don't get it twisted, Holyfield says the goal is to raise money for people in need -- and not to annihilate his opponent -- so the bout will be more of a performance than a no-holds-barred fight.