These guys were lost without science based training...
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This is like saying that the NFL isn't made up of bigger/stronger/faster players now than in the 1960's or 1970's because Jim Brown and Earl Campbell existed.  Those guys were outliers.  The depth of big, athletic players is so obviously greater now just by casual observation.  Even if the players are the same size, the combination of size, strength, and athleticism is unmatched.  
Still doesn't make it the golden era -- interesting storylines, rivalries, national attention, dominant all-time great players all factor in to that.  
For the NBA I'd consider the golden age to be 84-98 -- the first time the Bird Celtics and Magic Lakers played until the end of the Jordan Bulls.  
MLB it's the 1960's.  Nostalgia is such a huge part of it.  
Golf was the Tiger era -- '97 through 2009
College Hoops was the 1980's.  National attention was never higher with Phi Slamma Jamma, Villanova beating Georgetown, Jordan's shot to win the title for UNC, tons of all time coaching greats and personalities.   
The NFL may be right now.  It dominates the sporting landscape in a way never duplicated, except maybe the 1920's when baseball was the only game in town.