If your goal is to take good photos then avoid any outdated film. Unless you have proof that it was kept refrigerated or even better frozen. People will say anything on ebay. Still this only works against fog caused by heat. There are also cosmic rays and natural backgraound radiation to consider. Evenyually these will take their toll even for frozen film.

Agfa would typically run off a large batch of film and keep the master rolls frozen at -10 C. To be later cut and packaged.

If your intent is playing around and not serious photography then nothing is really lost except a bit of money and your time.