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...