Good post, but if I now finally get my diet right some weight gain should follow right? The diet Ive listed here blows away my old diet's from the past which were all over the place
Don't become so consumed in your quest for "mass" that you forcefeed yourself "junk" calories
(processed carbs, etc.). You mention having a fast metabolism, but many people would gain sloppy weight with a lot of the foods you listed above. I don't know how long you've been using this diet/training routine, but remember that - even if everything is in check - muscle growth takes time. There's a limit to how much & how fast you can grow, and there comes a point where no additional training or calories will benefit you. Keep an eye on the type of weight you're gaining over the coming weeks and months. It may be necessary to alter your diet to contain more protein & less carbs and/or even just fewer total calories.
That said...
It's not unheard of for trainers to make muscle gains into their mid-40's, but those gains will likely pale in comparison to what you could have accomplished in your late-teens; expect slower and less dramatic results. Don't let that put you off, though. Body habitus can still be changed at "more advanced" stages in life.
There are exercise and supplement protocols that will facilitate the release of human growth hormone. You may consider focussing on those. Some research has shown that our bodies manufacture hGH even into our 70's. While the conditions under which glandular secretion occurs diminishes, there are steps you can take to stimulate its release.
If you're interested, I can list some methods to increase hGH output. Again, it's not "magic" and will still take time to see results.
Testosterone is another matter. I have to agree with the HRT advice given here, which seems like one of the better options. I've talked to a couple of guys who have undergone professional hormone therapy, and they definitely "feel" it working. The steroid board can offer more input on that topic. You may even wish to do a quick search over there.
Some people have experienced favorable results using over-the-counter DHEA. Individual results vary greatly, though, and it's hard to predict how you will respond - I suspect that explains the wide range in user feedback. I'm not fond of most of the other OTC "test-boosters" on the market.