What's happening?

The Twilight Zone: 1x42

Welcome to Winfield

The grim reaper arrives at a hospital to take possession of a dying man. The man’s wife rescues him and takes him to the western town of Winfield where residents have been living for hundreds of years. Apparently, the reaper has failed to collect those living there.

The Twilight Zone: Season 1 Episode 42
Feb. 07, 1986