Where do people come from?

A conversation between Ethan and me while watching the Opening Ceremonies last night:

Ethan: Mommy, why won't I ever be older than Josh?
Me: Because Josh was born before you, and you can't change when you were born.
Ethan: Why was he born before me?
Me: Because that's the way God planned it to be. He made Josh exactly when He planned to and you exactly when He planned to.
Ethan: How does God make us?
Me (not wanting to go there yet): Well, I'm not sure, but (interrupted by Ethan)
Ethan: I bet I know how he does it.
Me: Really, how?
Ethan: I bet He says, "May I please have a person?" and He gets one.

Works for me.