How old is the Earth?

This was the question posed in the minivan as I drove four 7-year old boys to Hudson's birthday party. (This is Gregor posting). I'm not sure how the question came up, but the following conversation was very entertaining. Normally, I might have joined in or at least corrected any blatant fallacies, but this time I intentionality remained silent.

Hudson: How old is the earth?

Morris: The earth is about 10 thousand years old.

All: WOAH!

Luke: Well, I know dinosaurs are at least 60 million years old. So earth is at least 60 million years old.

All: WOAH, 60 MILLION!

Aiden: Well, I know for a fact, that there will be a meteor that hits every million years.

Morris: Yeah, but the meteor will burn up because earth has an atmosphere.

Aiden: No, this meteor will be huge.

Morris: So we're all going to die before we're adults.

All: COOL!

Aiden: No, a million years is like a really long time from now.

Hudson: Well, how do you know that?

Aiden: Because someone told me.

Hudson: Well, how does that person know?

Aiden: Because he's in eighth grade.

Hudson: Well, maybe he lied to you.

Aiden: No, eighth graders don't lie.

Hudson: How do you know they don't lie?

Aiden: Well this one doesn't lie. Trust me.

Hudson: Dad, how old is the planet?

I quickly google it on my phone: 4.54 billion years old.

All: WOAH!!!!!

Hudson: Dad, is there a meteor coming in a million years, or do they just come whenever they want?

Me: I don't know Hud, I'm not sure they are on a schedule.

Hudson: Well if seeing is believing and this kid hasn't seen it, then how could he know?

From this point the conversation descended back to poop and penises, but I must say I was proud of my little skeptic.