Don't grow up...

When my girls are little and being so precious it hurts, I often will ask them to stay little; don't grow up.
Tonight when I was putting Ava to bed, she was being very cute, cuddled up with an armful of stuffed animals. I asked her if she could just stay 4, because I sure liked her being 4. I said "Can't you just stay my little 4 year old?"
She said, yes, then changed her mind, and said "I can be your little 5 year old!"