#2: Brock Lesnar
At the age of 41, it's clear that 'The Beast Incarnate' Brock Lesnar can still go in the ring.
The only man to hold the Universal Championship on two occasions (as well as having the longest reign), Lesnar has become one of wrestling's biggest stars in his two tenures with the WWE.
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What fans may not know about the Beast, is that he is indeed a grandfather, as his wife Rena (who the WWE Universe will know as Sable), had a child in a previous marriage, making the conqueror of The Undertaker's undefeated WrestleMania streak a step-grandfather.
The multi-time WWE Champion is actually quite the family man in his personal life, as he loves to spend his personal time alone with his wife and children, but surprisingly he's also a grandfather at this young age.