It depends on how you use the guidebook, but 2002 is pretty old. If you just want maps and landmarks, they don't change. And if you do all your hotel and restaurant research before you leave on tripadvisor or someplace, then you're probably okay.

But if you have the guidebook so you could switch hotels on the fly, or pick a restaurant, 2002 is definitely too old. Think how long the pringing cycle is. 2004 is the oldest I'd go for. The big restaurants would probably be consistent, but small places can change fast.