My stuff will be here this saturday so I can post it here Laura.
B&W film is quite robust as long as it's stored reasonably.
Obviously faster speeds degrade/fog faster but I shoot 400 past date without issues. Not idea I know but.
I was under the impression that Neo 400 was only discountinued in 120 and they were still making it in 135.
Problem is the info is hard to verify for sure and different markets seem to have different products available.