If the sleeves were knit from the armhole down, taking out the cuffs would be a breeze. Just cut off the bind-off and unravel.
If, however, the cuff is the cast-on edge, it would be a little trickier, but not as unmanageable as you'd think.
These stitches have been in place for 25 years. They won't be itching to unravel. In fact, they're probably felted together to some degree.
You could cut off most of the cuff and pick out the stitches. The 'live' ones can be slipped onto a needle and you can start knitting.
What you can try is to run a piece of yarn through one of the rows near the top of the cuff to hold the stitches in place, but to be honest, I don't see them going anywhere on their own.