That's interesting, as I've read that Jade plants originated in South Africa.
Every article I've read say Jade's love arid, sunny and dry desert-like conditions.
What a contrast. My indoor jade plants have to be pruned. Otherwise, they don't branch out well. I've had many of plants grow straight up, until they can't support the weight, and they fall over. On a positive note, Jade's propagate so easily, it's snap to cut and re-plant with great success. So, pruning is the only way I can give them a fuller, bushier look.
Five or six years is great news. I am hopeful all my Jade's will achieve the size and fullness that I see in your plants in that timeframe.
Your Jade looks fantastic, and the pot is really unique, too.