Just because you have a "mint" appearing one does not mean it was taken care of or have had previous owner(s) who did not take care of it. I ran into this when shopping for both a GX470 and GX460 in 2020. Younger with less mile examples with too many wearable items needing replacement way too soon like brakes. That told me it was driven too hard and likely lacked maintenance. Because generally the people drive like that also do not properly maintain their vehicles.
Also, do not forget once you get over the 7-year-old mark the wearable items like hoses and the serpentine belt will need replacement if they are factory originals. Rubber and plastic still age even if low mileage and garage kept. If this was literally any other brand or model outside of a Toyota product, I would strongly recommend going for the newest lowest mileage example. Because in that case it does matter. The GX is unique in that mileage and age really do not matter, condition and service history absolutely do. These GX's can hide issues pretty well even if not maintained, I still would not trust an unknown-to-me newer lower mileage example without hard data proving its history and condition.
Now that the horse has been beaten beyond all recognition, so I'll digress.