Well... I'm 70.

I'm not entirely alone since I'm married (which kind-of presents its own problems in my case.)

My parents are both long since deceased. And I have no extended family, friends or even acquaintances really... by choice. At this point in my life I just prefer to be left alone. I only leave home when I have to go shopping with my wife or walk to a local store for something or other. I used to see a pdoc. But I got off med's & stopped seeing him about a year ago.
I tried seeing a few therapists for brief periods over the years. But it never amounted to anything. I managed to hide all of my mental health issues for the most part until I was 50. I'm convinced that, at some point, people reach an age where they simply become excess baggage on the mental health railroad, so to speak. I'm not sure at what age this begins, though, since at the age of 50 I was already there... no testing, no diagnosis, just open the medicine cabinet & hand 'em a fistful of antidepressants. That's pretty-much what it amounts to. I've just left it all behind. I've struggled with a lot of difficult thoughts over the years as well. Recently, however, I've resurrected some nice compulsions that are keeping my mind occupied. Oh well, whatever works I guess...