How is “any old” used?

In Doctor Who: The Day of the Doctor (2013), one line is: “We've got enough warriors. Any old idiot can be a hero.”

Which movie is “any old” from?

The clip at the top of this page is from Doctor Who: The Day of the Doctor (2013).

any item of the type mentioned (used when it is not important which particular item is chosen)

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any item of the type mentioned (used when it is not important which particular item is chosen)
Well, you're just saying any old name now.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

We've got enough warriors. Any old idiot can be a hero.

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