This is a great guide to date codes: http://www.yoogiscloset.com/authenticate/louis-vuittonI know my speedy 40 is vintage but how can u find out how old?
The definition of vintage can vary, but I would say if it is at least 20 years old it can be considered vintage. I tend to stick to pieces made before 1992 personally as I find that they are of better quality than even the new stuff.