Im the only one that thinks ageless mounts is a bad idea? I mean, since animal husbandry and taming will be branches of the artisan tree, I believe having permanent mounts will make eventually those branches useless when everybody gets the best mount with the best stats or when there are enough master tamers to supply the little demand new players offer. But if people needed to change their mount every month or so, it will keep the tamers/animal...husbandmen? busy since there will always be demand for mounts.
--EDIT--
You guys presented really great ideas,
I like having mounts age not by a set timer like with royal mounts but by usage, so if you have your mounts sleeping in your inventory they wont fade away, but it will start aging if you mount it, use it to pull a caravan, fight something or breeds. That way people can take a break from the game without worrying their lovely mounts will be dead when they come back.
I like that people wont automatically lose their mounts if it reach an old age, maybe having diminished stats and moving gradually slower will help avoid the annoyance of having your mount to die while traveling to another node, and forcing you to walk all the way back to your node to buy another.
I like the idea of giving the task to the people in the animal husbandry system to provide quality meat for recipes in the cooking branch so even if there is low demand for mounts they will still have stuff to do.
and I like that those ideas aren't mutually exclusive so we could potentially have all of this.

Let's hope Intrepid see this and takes it into consideration. I will keep posting in here any good idea you guys present