I think an old George vs old Tyson fight would be pretty dull. If Tyson waited, George could land the jab. Tyson would slip it and land some thudding body punches, and george would tie him up. Then he'd jab until Tyson slipped and landed some hard blows to the head. Lot's of wrestling, so who would wear down? That favors Tyson, but he'd land some hellacious body punches coming in.
Tyson was probably shorter when he was younger. The combination of jail food and Holyfield's ear may have caused a growth spurt late in life.