Not sure if it is so much how you store it, compared to the quality of it to begin with.
Definitely had some not so good batches that peeled the wrong way right from go in a shop I was in, and that didn't seem like it was old grip as they went through lots there.
Some I have had sitting around (flat sheets in sealed grip boxes) have seemed to lose the sticky feeling on older sheets, so for those being completely sealed away from the elements, there might not be a good way, so much as it is the longevity of the grip.
One guy I knew used to swear by cutting up rolls and keeping them flat, which made it easier to apply but I don't think there were any other long term benefits from it.
If you do cut it up, make sure you have the correct lengths to start with.
A couple of rolls I have are sealed in bags and they are still fine.