Hard to say. Deteriorating takes place due to chemical reaction. All I can say is take a chance. Years back I used to do weddings. we used "professional" color negative film. It was, if memory serves me right, the same as the color film sold off the regular self. As soon as the film was made it was shipped out immediately. This gave it a longer shelf life to sell it. The chemical reaction speed depended on the temperature it was stored in. There is a certain time that the film is at it's ideal peak. The professional version was shipped at it's peak and stored under controlled condition. We didn't buy it until we were ready to use it.
Also what kind of film is it? Negative or slide? I kind of remember shooting Kodachrome I had for some time and they came out great. Ektachrome is a different story. It tends to fade badly. I have Kodachrome movies from my dad shot in the fifties. Last time I looked at them were sometime in the 80s. Looked as good as the day they were developed. Kodachrome is known for longevity.
