You post that you can walk in a straight line barefoot and close your eyes and stand still and no wobbliness. I could at one time as well.

I've seen people walking like a duck (feet outwards) and they are not old and do not have any trouble as far as balance. And I've seen the same with older people.

I am unsteady due to muscle loss from CMT. But I do not, and never have, been duck walking. I am not young either. Just my 2 cents. And yes, everyone is different. I am certainly not saying that you have CMT. That remains to be found out. I hope you get some answers.