Which heavyweights had the most effective style even if they were old?

[REDEEMER]

I say Wlad and George Foreman.
Wlad really could beat most of these guys even today, hell, I give Wladimir a chance against AJ and Fury.

As for the worst style for someone who is in their 40s etc. I'd say the Mike Tyson style, basically brawling/infighting is your enemy in your 40s.

I always think defence first personally. I love boxing, but I also would love to hang it up with braincells. A passion for a hobby isn't worth dying for

Mike Tyson’s style requires the utmost athleticism because it’s a counter punch defensive slipping shots simultaneously,it’s why he couldn’t even replicate it in the late 90”s as it was designed.

[LeOoze]

Larry Holmes comes to mind.

Did really well against a prime Holyfield despite being 42 & chubby. He was clearly past his best but still put up a great fight, the only thing that got Holyfield through that fight was his youth.

First person I thought of

[15round]

I think Larry Holmes did well.