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[Durian Fiend]

The Disinatron strikes me more like Asimov's "Pebble in the Sky"

It may not have been Twilight Zone...

It wasn't, according to my search.  Really couldn't come up with anything under that name.

However, there was this:     "The Happy Place" was a 1958, hour-long script written by Rod Serling intended as [i]The Twilight Zone[/i]'s pilot episode, but it was rejected by CBS for being too dark, grim, and depressing. The plot centered on a dystopian society that forced citizens to be executed once they turned 60, deemed "obsolete". 

[size=1]SYFY +2[/size]