I can't say that I've developed any Tri-X that was exposed 8 years ago, but I do come across some old stock that had expired about that long ago. Most of it comes from people in my local camera club who have stopped using film in favor of "that other form of image capture."
Most of the time it's pretty good. Tri-X that old seems to pick up a little base fog and drop a bit of speed, but is otherwise quite useable. It depends on the storage conditions. Stored cold, it's not too bad. Stuffed away in the back of a sock drawer somewhere? Not so good. TMZ, well that's another story. I have some in my freezer that went out of date about 4 years ago. It hasn't held up well, nor had I expected it to. Lots of base fog and speed loss. Sure you can print through the fog, and there is lots of grain. If I were to use it, I'd probably rate it at 800 and use a development time for between 1600 and 3200 to pump up the contrast. I suppose there is some use for it if I wanted a really grainy look and didn't need a whole lot of speed, but that's not really my style. Maybe abstract macro photographs of flowers and such would work.