How much expired? Which format?
My recipe for the old 120 and larger FP4 and PX from 80's and 90's is Rodinal 1+50, ca 12 minutes, box speed or little less. A half stop or so.
1+100 is not good fogwise, it will give you every bit of it, present on the film.
Weird enough, while doing experiments with Rodinal and HC-110, there was no substantial difference in fog for me. If the film is dead, then it is dead in both.