I know of two friends that are caring for elderly married partners at home. When I looked up "eldercare" in Google, the first several links were for those seeking a full-time situation for an elderly person. Both of my friends had their partners in an institution but decided they wanted them at home instead.
We had a case in Wisconsin where a longtime cohabiting man and woman were at odds with each other over the woman's care for her father. The man became so upset over the time and effort she spent taking care of her father that he killed the father.
It is interesting to search "When is it time to die?" I suspect that various states or groups or cultures may develop some ideas of what sort of life might not be worth living. I remember a veterinarian in a Bill Moyers special about death who stated that he put down large animals and could take himself out of life if he wanted to. However, this man later became unable to administer the death-dealing drug to himself later after aging.
I have no idea how often an elderly person asks for death. A quick perusal of some search results gives me the idea that many elderly people can and do accept the idea that death is approaching but that asking to be assisted in obtaining death is rare. Here are some results from a Google search:
How do individuals access and use death with dignity laws?
Be a resident of California, Colorado, District of Columbia, Hawaii (after 1/1/19), Oregon, Vermont, or Washington;
Qualify for a prescription under physician-assisted dying laws;
Be 18 years of age or older;
I imagine that both an elderly person and a partner or other person caring for them could come to the conclusion that the cared-for is negatively affecting the life and joy of the carer.
