68 here. Been retired with my wife since early March '20.
I've always preferred my own company to the company of others. While I love my wife and love being with her, if she were to die (or divorce me), I would be perfectly happy being by myself for the rest of my life. I could see myself knowing the end was near and walking off into the wilderness to die by myself. Full disclosure: I have two kids and two stepchildren, one of which I've been with since she was eleven. It doesn't bother me that they wouldn't know what happened to me in that event, for reasons...
I made a comment in my teens to my mom that I could see myself being a hermit in a cave on a mountain. She told my siblings later in life that I wanted to be left alone and not to bother me. While I was somewhat offended that she would tell them that, there IS a certain amount of truth to it.