A Peak Norton, Vs An Old Foreman?

Foreman would still probably win given that Ken didn't do well backing up and Foreman would still be pushing Ken back at all times. Ken did not fight well when forced on the back foot...forced being the key word...

Young Foreman, Old Foreman, Older Foreman. All three were arguably the strongest heavyweight champion of all time. As strong and herculean built as Norton was, he was NEVER stronger than Big George and would have always been forced backwards. Prime George did the trick in two rounds. Old George would likely do it between 7 and 10. Old George was more patient yet still a literal pain to get around and he'd still be keeping that heavy jab in Ken's face to maintain control over distance and balance.

It'd be a matter of time before Foreman started landing his bigger punches and freeze Norton up enough to end the night.