A loooooooooong time ago

I was explaining to the children how God has always existed. 

He was there 100 years ago... A thousand years ago... A million... A billion... A trillion...

5 year old: an octillion

7 year old: a googolplex,*

Wasn't expecting that 😆

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*Fortunately I did know this was a real number! Didn't know how big, so I've just looked it up. It's 10¹⁰¹⁰⁰, which means that the mass of the books needed to write the number down would be many times the mass of the visible universe. Fairly large, then.