The mouths of babes

Catherine, sitting in the car, pondering important matters:
"I want to be a grown up."
Mummy:
"So, how old do you have to be, to be a grown-up?"
Catherine:
"Six thirty."

Mummy's birthday. We have just met the neighbours and Catherine informed them about the event.
Neighbour: "So, how old is your Mummy, do you know? Is she twenty-four?"
Me: "Oh, she knows, she's been asking me three times a day for the last week."
Catherine: "Forty-Four."
Thank you, darling. I'm still in my thirties. As you well know, having asked three times a day for the last week.

Catherine, playing doctor.
"Daddy, you have high temperature."
Daddy:
"How high?"
Catherine:
"Fifteen kilo."