I can really see Kane going another 5 years, I cant remember him having any big injuries, he seems to be able to go at a better level then the other guys who came around in the same era, like Big Show and Undertaker, not really show many signs of slowing down that much. I think he could go 5 more years but i think he'll be gone before that, he wont want to be one of those guys that sticks around when his time haspasted.