You know what is the difference between girls aged: 8, 18, 28, 38, 48, 58, 68?

At 8: You take her to bed and tell her a story.

At 18: You tell her a story and take her to bed.

At 28: You don't need to tell her a story to take her to bed.

At 38: She tells you a story and takes you to bed.

At 48: You tell her a story to avoid going to bed.

At 58: You stay in bed to avoid her story.

At 68: If you take her to bed, that'll be a story.