Bagger,
Thanks for sharing your experience. Except for Yoga and Glutamine (tried it and it didn't seem to do anything) I do pretty much everything you suggest....I'll admit to cutting some corners lately do to being plan tired... but other than that it seems like I'm doing all I can do. It is a tad sobering to think I'm just going down the toilet in ever decreasing spirals. I think if I stopped golf, I'd have enough energy to stay pretty strong... but that isn't happening. And then again, who knows how long THAT would last. I won't go without a fight.... but I'm losing this one right now.
The only reason I suggest Glutamine is that it helps muscle cells recover. I haven't "noticed" it's effect directly but I haven't gone cold turkey on it either.
I know the fatigue you are talking about. When I'm doing all the right things and I get it, there is usually something else contributing. Not saying that what's happening, but I would definitely examine stress sources. The human body is an amazing thing, but in terms of stress it has a hard time distinguishing the good kind from the bad kind. It tends to react by default to all stress being the bad kind. So exercise stress gets blended with all the other stress in our lives.
In terms of that downhill age thing...fergetaboutit