How can I stop the biological clock?

When I got to work this morning, a man got on the elevator with me. He studied the width of the 1100-page book I held, The Executioner’s Song.
“Norman Mailer. You must not have any kids, to be reading a book like that,” he said.
“No, I don’t have any kids.”
“I used to read books like that,” he said, a bit of envy in his voice. “Now I read Dr. Seuss and the Princess and the Pea.”
There are only about 1000 more books on my reading list (excluding the complete works of Dr. Seuss). So I might get around to having kids when I’m 63, maybe 64.