Developing expired B+W film is "try and test" experiment, as noted above, depending on how long and under what conditions the films have been stored.
I would suggest as a starting point, use either Rodinal or HC-110 as a one-shot with a 1:25 concentration and add about 10% to the recommended development time.
The 1:25 concentration will yield a more contrasty negative, thereby reducing the apparant fog base. The fog base is not actually reduced, but relative to the blacks it will seem less visible.
Gentle agitation is important as is complete fixing.
If excessive grain rears its ugly head, you could try adding a 10% ( by volume) Sodium Sulfite solution to the developer.
After having made some test prints of the first roll, you should have a good idea on how to proceed.