I have kept up with this stuff for a while. I've played the game since I was 5 and turn 30 this year. I'm also not bad at making wild assumptions. It's fun.
I just happen to notice that not long after the PGA implemented drug/doping testing similar to other sports, the Tiger "decline" began.
Sure, symptoms in that knee and back may have been there before. But were the drugs helping keep it a non-issue?
Mid-30's in other sports is retirement time, in golf you can keep on going.
I keep having this sneaking suspicion that he was on some kind of juice that helped him through any physical issues that got worse when the PGA adopted drug policy.
I dare not ask this question on a golf-dedicated forum......