Why is Grandad old?

Because he was born along time ago.

But we’re not as old as Grandad. Why aren’t you as old as Grandad?

Because Grandad is my daddy. You can’t be older than your daddy, can you?

No! But Grandad will get older and older and older.

Yes.

And then he will die?

Yes.

And we will get older and older and older and then we will die. But that will be a very very long time.

Yes.

But we mustn’t talk about things like that.

– A conversation with The Professor –