It's not a matter of working, it's a matter of enough arm movement to keep the watch wound. I'm in my 70's and I have a few automatics that work fine on a watch winder but will stop after 4 days of wearing, obviously I'm not active enough to keep them wound. Some designs are more efficient than others. Frankly, I would be surprised if most 80 year old guys could keep an automatic watch fully wound. Just a result of natural aging, less physical movement.
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