English Idioms

"when it's allowed to be five"

I saw this sentence in a text. Is it an expression? If yes, what does it mean ?
Thank you


  • When cat's away, the mice will play.
    Bobby is 10. When the schoolmaster's away, Bobby feel free to pretend to be 5. All classmates rock the house. But are they actually allowed to be 5?

    Teddy, Bobby's brother is sharp 5. He has just got to be 5 years old this very morning.
    Sometimes Teddy feels it's hard to be five: sitting still, shutting up...
    Sometimes Teddy feels it's great to be five: unlike Bobby, he has no homework to do.
  • I appreciate the way of the answer.

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