Frostie
Frostie, not Frosty
Plenty of ironmen that are older and considerably fitter than either. I doubt Ronaldo or LeBron could swim 2 miles, bike 110 miles and then run a marathon one after the other.Well Lebron James is 40 too and plays at a considerably higher level.
They're both insanely fit for their respective sports, but there's levels to fitness. I took part in triathlons for a few years, did fairly well in a few too so I was relatively fit. I wouldn't even have attempted an ironman without a major 6-12 month training regime and a total change in diet, work and social life.
Elite boxers would make them both look like 20 a day smokers in comparison as well. Well, lighter weights would, not tubby lumps like Fury/Ruiz/Zhang etc.