When my DH passed away in 2000 that left me living alone for the first time in my life. I had lived at home till marriage and suddenly found myself one day as the only adult in the house. I have one DD living away at college and another DD in high school who is busy with school, work and boyfriend. So when I am home, it usually is by myself.
I will not say that I enjoy living alone, but it is something you get used to. For some people it can be a welcomed relief to the alternative, I am sure.