Kevin Parratt , Mar 22, 2012; 12:03 p.m.
David, it depends on how far out of date. If correctly stored as you say, a few years will make no difference, especially if negative film. I've got loads of B&W of various types, in all formats, anything from 5 to 15 years and some much futher out of date. The 500' bulk rolls of 70mm I will batch test then go for it.
If colour transparency, best get some advice over at Film and Processing.
Good luck, Kevin.