If anything I rather die when I am asleep because feel you won't notice it at all. I think thats the best way if your going to die. In your sleep. Peacefully like that.
I feel my time will be around 89 into my 90s and 100s. Thats a good time to leave this world of ours and enter into eternal life or what ever exist beyond this life. I feel you did all the things you wanted to fulfill in your life so what do you do at age 99? Nothing. You might as well just go you know.

But isnt it wierd that we are all going to die someday? It's a fact of nature. That is so strange.