Age of Microsol question...

Ok heres the story, at my LHS the've got a pack set of micro-sol and micro-set n the like, but i know thats its been there for at least a year or so, maybe more idk. The question is do you still think its all right? i think it will be ok, but idk does it go bad in a period of time? If anyone has any experience with this i could use the help, thanks!

I've got bottles which are 3 years old and every bit as good as the day I got them.

Wow great, well if open bottles have lasted that long im sure its no problem, thanks a lot Freakray