For me, it started when my dad had a heart condition and wasn't physically able to run a tractor/combine.

When he recovered, his reaction time had really slipped.  If an alarm went off, he would panic and then start hitting random buttons and make things worse.  We had an extra combine in the yard for part of a harvest and he was mad that he wasn't allowed to run it.  I finally gave in and let him run the grain cart, because he thought that would be easy for him.  After 1 afternoon of almost running into headers, and trucks, he was done and hasn't asked to run an implement since.

There was a lot of resentment on his side for a few years, but he accepts it now.

He is now early dementia and giving him the task of feeding/watering 25 chickens is taxing on both of us.