Do you have a negative that can serve as a good reference negative - essentially your own "Shirley" negative? You may end up handling and using that negative a lot, so it shouldn't be one that you are going to want to make prints of particular meaning in the future.
If so, using your normal procedure, make a rally good print from it on current paper, and record details about magnification, exposure, and filtration used. If you have a colour analyzer, take representative and repeatable measurements and record them as well.
Now take some of your expired paper, and with the exact same magnification, make the best print you can from that negative. Again, record details details about magnification, exposure, and filtration used. If you have a colour analyzer, take representative and repeatable measurements and record them as well.
Now compare the results and the two prints. The differences will tell you a lot about the sort of adjustments needed.
You may also find it useful to have different "Shirley" negatives for different types of lighting. A portrait "Shirley", a high contrast still life "Shirley" and a lower contrast landscape "Shirley" might be examples.