I believe there was talk when it first came out that they were going to do a run per year, similar to what Kodak and Konica used to do for their IR films.
For what it's worth, I've been shooting a fair amount of it's predecessor, the Efke-made-Maco-labeled film which is supposedly identical, and it hasn't seemed to age much. It's about 2 years past date and I have kept it refrigerated, but not frozen. Slightly less sensitive to IR and very slight increase in base+fog.