Welcome ta' Basenotes, Ronin!
Y'all shouldn't have too many problems with Disc. frags... As long as they're stored properly, they'll not degrade. Light is tha' main reason frags go bad. Since most discontinued frags are stored in their packaging in a dark wharehouse, this is generally not a big deal. As for yr. query about frags agein'... some members here, will tell ya that tha' older ones get BETTER with age! Finally, any quality retailer is gonna be more than willin' ta' stand behind their product- if it's not right, they'll take care of it.
No, tha' only problem Y'all are likely ta' have with these, is their rapidly escallatin' values...