How Are the Duchess and Belinda Blumenthal Alike?

When the Duchess strips off her riding gear under the shower, Rocky writes that, like Belinda, she is well endowed. Jamie, James, and Alice read that as breasts, the same joke they have made about Belinda all season. The difference he then adds is age. The Duchess's backside shows "fifty-something years," and childbirth has not been kind. So the book pairs them as similarly built women and separates them by age. The hosts are startled that Rocky gives the Duchess an age at all. She is over fifty, a mother, and still the one giving the orders in the chalet.