I agree with Qball, the fog of the old color film may result in no recoverable images. The Darkroom is good for developing, but in this case, I would have recommended
Film Rescue, as they specialize in 'found film'.
I'm interested in knowing what film it was. Lots of the old color film developing processes can no longer be done, and trying to cross-process in other color chemicals can result in the latent image not being recovered.
I have done a number of old found films, and what I would ask The Darkroom to do, is to process the negatives as black & white, using either HC-110, Rodinal, or maybe Diafine. Then, do what Film Rescue does, which is scan the B&W images, then re-process the film in best-guess color chemicals, after a bath in potassium ferrocyanide and potassium bromide (I think).
With old color film, the chances of recovering images lessen as time goes by, but with the above method, you would at least have a B&W image.
I have personally processed some old color found film in D-76, which isn't the best choice, but had reasonable results. Oldest roll was circa 1954 (vehicle license registration sticker gave the date), and the oldest B&W roll I've ever done was from about the 30's, based on clothing styles.
Let us know how it things develop (pun intended), but I wouldn't get my hopes up too much if it was very early color.