I saw this TV drama in the late '60s/early 70s in Los Angeles on (I think) public television. It was a sort of prequel to Logan's Run in which youth culture dominates the world and older folks have been sequestered.
The story: a small group of oldsters have been quarantined in an isolated hotel or rooming house with no contact with the rest of the world. All they have is a single TV channel which broadcasts youth propaganda and they are worried that the government is going to take the final step and euthanize them all. It was definitely an American production as it was filled with character actors I recognize but can't name.