When did the Golden Age of Comics end?

This year's Advent Calendar is about spotlight Golden Age Christmas stories. My "problem" is that I don't know what I should be using, years-wise, for "Golden Age." I know I am safe if I just use 1950 as my cut-off, but obviously there would be more material available to me to use if I put the cut-off later, such as the introduction of Barry Allen in 1956.

What do you folks think?

Whatever you vote for will be my guidline in choosing stories for the Golden Age Christmas!

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