When the time comes, a gun, a bathtub full of warm water and a few minutes of "alone time".
Because there are times when chronic pain (physical) is too much to deal with. Along with the also chronic conditions that often afflict the elderly, which make you completely dependent on others to even manage basic functions as moving from one place to another, keeping yourself clean, or even getting your own drink from the fridge, I will eventually reach the point the quality of my life is no longer "with me". Once I see that I am becoming a burden to those I love (my son and his girl), I will go ahead and move to what is next. I have to admit, when my pain levels are really high, and/or when I try to do something I have done my whole life and now find is basically impossible due to physical limitations, I do stop and ask myself if I need to go ahead and tie up whatever loose ends I have left laying around.
That is something else that has changed about me -- I stay on top of things better than I ever did before I was suicidal. I do not want to burden my son and his girlfriend any more than I already will have so I keep my bills current (and for recurring bills like utilities I keep a credit balance so they will not have to pay anything from my estate), all my passwords are kept up and current in a notebook that also lists all my accounts, their websites, insurance information and copies front and back of all cards for medical insurance, social security cards, driver's license, car titles, yada yada yada. Basically, if it is important there are copies, certified copies or original documents, depending on what it is. A list of all guns, along with serial numbers and any documentation needed for items/weapons that are considered Class III. There are also several certified copies of my: birth certificate, marriage license(s) -- I have been married twice, death certificates of my first husband, divorce papers, etc. There is even documentation of each pet and their vaccinations/last vet visit, etc. Lol (Can you tell I worked in a legal profession in my most recent life??

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So ... Basically I will stay until I cannot care for myself any longer. My son and I have discussed this and while he doesn't want to see me go, he also understands that dying is part of living the life we have now. And that eventually the physical pain will get to be too much for me. I already cannot find a comfortable way to sit now. And I don't remember the last time I got a good night's sleep because the pain in my back and hips just will not let me get comfortable. Anyway, we will find each other in our next consciousness. We may be separated by which realm we are in, but we will NEVER be separated as long as our hearts feel each other. And THAT feeling ensures we will ALWAYS be together. No matter what else is going on.