How old do you guys run horses for riding packing in and out in the mountains. I know it really depends on the animal. My real question is, I am about to buy a 17 year old QH for my little boy. He is in great shape, but can't go all day long at a hard pace (roping, cutting, etc) anymore. I'm just wondering if I would be pushing this horse too hard on using him for a trail horse next year for 5-10 mile forays into wilderness areas from a base camp.