comment: >
  
  okay. it premiered this year, and I see two or three aged 50 or older as main cast. the rest are under that. I see favorable reviews, but I don't know how long it'll last. but that's something to look forward...
  Well, I almost forgot New Tricks, a British mystery crime series about retired old men assisting a female police detective.
context: First counterexample I could think of is the new cop show East New York where 90% of the main ensemble are middle-aged-or-older (do they all have to be elderly to satisfy your requirement) and only one or two of those isn't currently in a committed relationship (not sure if you said anything about it but that's a counter to some people's common TV drama stereotype of it being "the love and sex lives of young pretty people")