I've had a few people write to me saying their lives are adrift. They've lost interest in everything. No libido. No hobbies they are interested in. Trouble getting out of bed in the morning. Not so interested in meeting people or dating. They go to work everyday and take care of all the basic stuff so they are functioning -- but life is a grind.
If this goes on for a while, it could be a low level, persistent depression. The clinical term is dysthymia. Aka Persistent Depressive Disorder or Neurotic Depression. Low energy and drive, and a low capacity for experiencing pleasure in everyday life.
What to do about it? I guess some would immediately jump to prozac or maybe psychotherapy. I'm not sure that solves the underlying problem. If you're a single gay man over forty, life can be hard. Meeting someone can be hard when most of your "compatriots" are really looking for a hot 25 year old. I think building up a good network of friends will help a lot. I wish others felt the same way so they would put as much effort into it.
These decades when you are 40's and 50's and 60's should be some of the best in your life. You're probably more financially stable. More established in life for sure. More comfortable with who you are. But this is theory. There's no easy answer.
I hope readers will comment on this. I was disappointed that there was little reaction to the videos I posted.