My biggest fear about living alone and death is that I will die in my bed overnight, and nobody will know for a time. After a week, my dog Crystal will either die of hunger or be well fed.
Strangely enough, my thoughts about death are somewhat similar to yours. I live alone with half a dozen pet reptiles. If no one found me for a week, my crested gecko would likely starve. My snakes would be okay for about a week as long as their water didn't evaporate. They could go a month or more without food without being too uncomfortable, but they'd need water at least once a week at a minimum.
There's really no one who would come by my house enough to find me if the folks at work didn't raise an alarm. The folks at work would be curious if I didn't come to work and didn't call for a couple of days, but technically, no one in any kind of supervisory role is allowed to check. I'm sure that if I didn't show up for two days, someone would find some excuse to come by my house. The question is what they'd do if no one answered the door and there was no outward sign of a problem.
When I retire, I'm not sure how I'll handle this situation. I'd like to retire someday to a good amount of land so that I don't have people crowding me in my "golden years." I guess I'd try to make contact with someone in some group and get people in the habit of checking on me. I'd hate to think of my animals suffering after I'm gone.
Bill
Either I will drop dead while trimming the shrubs and the neighbors will notice the ravens after a few days, or I will expire indoors and the neighbors will notice the shrubs haven’t been trimmed by July.