Results are likely to be fair to poor, but you should get something. Some people prefer developing old film, even old color film, as B&W, often using something like Rodinal 1+100 in a stand or semi-stand procedure (with minimal agitation and extended development time). This procedure is supposed to help produce consistent results when you're not sure of the proper development time because it's mystery film or because its age might affect optimum development. I've never done this myself, though; I'm just passing on what I've read.
If you do it with a regular C-41 process, you'll probably get color, but it may be foggy and/or the colors may have shifted. Printing in a conventional way might enable at least some correction for this, and scanning the negative might enable you to do a little better, if proper color rendition is important.