Question

means of 'as old as a church mouse'
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Answer 1

Explanation:

If someone is as poor as a church mouse they are extremely poor. ... The phrase is derived from the fact that church buildings don't store or provide food and therefore mice in such buildings were utterly destitute.

Answer 2

Answer:

The simile as old as a church mouse means that the person they're directing towards is extremely old.

I hope this helps you out :)