This will give me nightmares:

When I was married at the age of 22 and relishing an active sex life, I assumed that this was a pleasure that my middle-aged parents rarely, if ever, enjoyed. Now, well past 70, Rosalynn and I have learned to accommodate each other's desires more accurately and generously, and have never had a more complete and enjoyable relationship. -- Jimmy Carter

(credit Spoons for the link)