My bearded dragon is 8+ years old. No apparent health problems ever.
I've noticed, though, that his aim seems to be off when feeding. Most of the food he eats is from hand/tongs, but lately (few months?) I've noticed he is striking a bit off from the food. I just get it very close so that he can't miss, but it is definitely missing. For example, if I hold a roach for him to grab, either on the left or right side, when it catches his eye, he bites at it, but a little off. I tried the right side and the left side, but it doesn't seem to matter. I know he can see, but something is unusual.
You should see frogs' terrible aim! ?
I follow the StickyFrogs account on Instagram, and watching them eat, one wonders how they manage to get any food in out in the wild!