If you use the programs on those tapes, you'll want to think about transferring them off magnetic media and onto something with more longevity.
Video tapes have a tendency to self destruct over time. As I understand, their life span is 10 to 20 years under average conditions.
Even a home-burned DVD has an expected lifetime of 50 years or more if stored properly.
Secondarily, rewind the tapes every once in a while. Leave them "heads out" or "tails out" at alternating intervals.
As the revolutions of tape lie together on the reel, the magnetic signature tends to "print through" onto the adjacent layers, thus degrading the data on the tape.
Rewinding the tape and leaving it in the opposite orientation helps to randomize the positions of the layers of tape that lay together, thus preventing print-through.