Well, to be fair, adventuring really isn't an elderly person's passtime, for the most part. It's very taxing and dangerous. There's even a couple of NPCs (An elderly Elezen and a Doman man) in the Rising Stones who discuss it. They do what they can, but that's unfortunately not a great deal at their age, what with their backs aching and joints getting stiff on damp nights (Which is when the best hunting is!).

And then you have our dear Scions, who are actually on the older side and concealing it with high-grade Sharlyan cosmetics XD. One of these days I'd like to catch Thancred complaining about his back and hastily trying to cover it up when he realizes you were listening.