I have some Forte Polywarmton that prints like it was new. I also has some Polygrade that fogs hopelessly. I recently got some Fortezo and some other graded Forte paper that I haven't tried yet.
It's a bit of a crap shoot, really, if it's going to be good or not. Sometimes printing on old paper can be tremendously frustrating. What I do with paper that fogs evenly is to print as normal, and then give 15% more exposure. Then I use bleach until the fog is bleached off, was, refix, and I usually end up with a nice print. But I have fresh paper that needs to get used up before it gets old too, so I usually use the old paper for lith printing.
If you like experimenting, old paper can be fun. If you like knowing what to expect, and seek nothing but the best and most repeatable results, old paper can be an absolute nightmare.
I hope you have fun with it!