Are you able to add a pic? Firm believer in and practitioner of the excellent info above, because of the excellent advice above from long ago, so my next comments are not discounting or detracting. In particular about Jades, have seen so many decades-old Jades over the years that have never been disturbed.
I've never found much roots when uprooting Jades or repotting them. Even when put in the ground for 7-8 months and the one amazing specimen that I stuck in the ground as an unrooted branch and it survived 2 winters before I got nervous about it and pulled it up. Even that just had a little "poof" of roots, like wiry hair. They did look congested but I think that's just the way Jade roots are. It does seem like it would take decades for roots like that to fill a gallon size pot.
When they get top-heavy and are in danger of falling over, moving to a bigger/heavier pot can help. If you do disturb it, don't water for a few days to allow any wounds to the roots time to dry and seal.
