Photography

My prediction is that the black and white films will be better than you are expecting, but the color films will be a challenge. For color I'd just send a roll to be developed and let them know how it was stored and for how long. If you happen to be in the US this company has experience with old film:

https://thedarkroom.com/old-rolls-film-developing/

If you decide to home develop the film I'd suggest starting with a roll of Plus-X, and developing a test strip cut from the first roll, just a few images. (One image will be lost from the roll due to cutting it in half but it'll be worth it.) This will give you information that you can use for the rest of the roll and subsequent rolls. You (or whoever develops the film) will need to extend the development time to account for how much the latent image has faded. The shadows will likely be gone, but the mid-tones and highlights can be brought back to life with extra time in the developer. If I was in this situation I would develop the first test strip as if I had exposed the film at iso250 instead of iso125 and adjust from there with another test strip if needed.

I know a photographer who bought a vintage camera that had a partially exposed roll of film in it that was decades old. She went ahead and finished exposing the roll with her own images, and that made for an interesting comparison because half of the roll had latent images that were older than her, and the rest of the images were fresh. The result? The "old" half of the roll had faded but usable images, and the "new" half of the roll had no images at all. The vintage film held on to the old images but apparently could not record new ones. Amazing.

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