I still have an unopened box of 4x5 from the mid 90s, frozen the entire time except for transit time from TN back to GA when I moved, and even then I packed it in an ice chest with cold packs. Should still be good. Guess I should really use it.
Just shot some 8x10 expired in 1995 and stored frozen the entire time. Looks great. Yes you should use, as it's not getting any younger.