I went down the road of buying old film to play around with. As has been said, the slower the film, the better they usually keep (less fog).
I had some 1960's Panatomic-X which was completely useless, but there was some 1970's Plus-X which was perfectly fine, and some 1980's Tri-X that works great. I'd say the Tri-X and Agfa SSS are probably not going to work very well. In the Agfa film, you have historically interesting film, since it's from World War II. I would keep it as a historic artifact. I used FA-1027 developer for all my outdated film, which develops film very cleanly. The Flying Camera offers great advice with benzotriazole.
- Thom