As with any other ancient film, it mostly depends on the storage conditions. If the film has been frozen throughout, I'd go with normal speed and processing and would expect usable results (though don't use it for your daughter's wedding photos....). Otherwise it's a case of trying one test roll and working from the results.
I used a 35mm disposible camera earlier this year, expiry 2005 and found in a desk drawer in a normal warm office, and the results were fine. I've also just had processed an E6 Agfa film (made by Agfa, Leverkusen, therefore pre-2005, but kept in a cool place), again perfect results (and I am very critical !).