Another Shorty owner, but a young 61. I do notice it is much easier on my left hand when playing my Shorty or Taylor 522e (same 24.875" scale) compared to my 814 (25.5" scale). It also feels like there is less downward pressure needed due to the 12 fret, but that may be wishful thinking.
One other thing that might help: a couple decades ago, we started escaping the frozen northland in the winter, for the Tropical Tip of Texas. Dipping into the soft water on a paddleboard or kayak is just as much exercise but less impact than skiing on that evil frozen white stuff. We used to do that winter outdoor sports thing, until my wife said, "Take me someplace warm," one cold February in the 80s. My hands definitely prefer the warmth. Just something to consider.
Regarding the reasoning, the 522 came after the Shorty, with the realization that the small difference in scale length does make a difference to me.
Good luck with the decisions,
Captain Jim