I don't know but pro bodybuilders so called "genetically gifted" when they reach 50 + they look really Damaged and older compared to others retired pro...
Im not talking about mass monters over 300 pounds those are still under 50 years of age...
Im talking about 95% of bb over 50 years of age !!
look at Frank Zane, he's 64, but he looks 80!!! i know people his age that look way way better than him and he wasn't even a 200 pounds bb!!