To still be elite level at mid 30s is an achievement. Boxing is a hard game. Camps, sparring, making weight, also take a toll.
Didn't we do this thread a few months ago? I remember saying JMM, Martinez, Mayweather, Moore, Hopkins, Zaragoza, plus heavyweights. Most of those are obviously pharmaceutical miracles, but some is good genetics and technique.
GGG v Canelo now sort of reminds me of Vitali v Haye way back, just when Vitali was beginning to lose that ferocity around the Chisora time period. Its a much closer matchup than it ever should have been. Prime smaller athletic banger versus the ageing Soviet destroyer!