A womans life cycle

What is the difference between girls/women aged
8,18,28,38,48,58,68,78?

At 8 – years old 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 – She tells you 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

At 78 – What story?? What Bed?? Who are you???