I see that the OP was made right before he went on his 6-2 run, turning away a few prospects in the process, so I hope his performances answered that question…
Even at the ripe old age of 75, Andrei Arlovski is still a top heavyweight in the UFC.
I can see him having the same shape as he is now and still fighting year 2030.
I mean Ken Shamrock kept fought at 51 back in 2016 against Royce Gracie in Bellator.