as deggers says, it all depends on the inks and papers. I've got perfect 30-year-old photos in my albums sitting right next to ones taken the same week that have turned blue. If you haven't got tissue paper between the pages, that also makes a difference, I've found; parts of a photo pressed against another photo fade differently from parts pressed against the album page. There's probably a thesis in this somewhere... Anyway, as others have said, you should be okay if you have the negatives; if not you may be able to improve them with Photoshop, but you're unlikely to get them exactly right unless you remember the exact colour yourself.