At what age should you tell a child that The Easter Bunny, The Tooth Fairy, and Santa Claus aren't "real"?

Update: .........they are 7 & 9 and they are very smart. They caught the "Tooth Fairy" with a tooth, now they question every thing. It's so hard to redirect them, I can't lie to them. So I end up laughing about it which encourages their thinking that they don't exist.
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