-
I've done the same thing before and got the film developed , turns out the door had been opened and wiped most of the pictures but still got 2 very grainy images from the beginning of the roll. Was also about 15/20 years old. I then shot an unused disposable that was about 10/15 years old from the same batch of cameras and got some good photos still with a bit of wacky colour shift, so worth it in my opinion!
I found an old film camera in the loft at the weekend that still has a half used film in it. I don't suppose there is any chance that the film is any good after 20+ years and could be developed?