Larry,
Color paper, you can likely search the web and find the product handling sheets. in my opinion, is a lost cause 100% of it.
B&W paper. I have printed a lot of my work on old stock paper kept cool or frozen for years before use.
Not all of it survives... but what does work, after time, just becomes very flat, contrast wise at some point and unusable.
Testing BW paper. What I do is mix up fresh chemicals, and process half of an unexposed sheet of paper for 1.5 minutes in my developer by 1/2 dunking it with agitation, then put the whole sheet into stop and fix, and then evaluating the developed 1/2 against the undeveloped 1/2 to look for fog. If it's acceptable, I try printing a negative I have that I have a fine print of. I go and try printing that negative in the same way, but on the outdated paper and see if it's contrast is good -- or gone flat - contrast wise.
Good paper worth saving you can add a Benzotriazole solution to your developer to help the fogging (See Photographer's Formulary for that)
In the end, It may all be a lost cause, and worth what you paid for it
but you never know.