“Every batch of sperm represents an opportunity for genetic typos - called de novo mutations - to be passed on. A 20-year-old man and woman will each pass on about 20 de novo mutations to a baby they conceive. By the time the couple is 40, a woman's total has remained at 20, while a man's has jumped to 65 - and it keeps climbing from there.”

American magazine editor and author

Jeffrey Kluger is an American magazine editor and author. He is editor at large at Time magazine and has written thirteen books across a range of subjects. His books include works on psychology, medicine, family dynamics, and spaceflight, among them The Narcissist Next Door, Splendid Solution: Jonas Salk and the Conquest of Polio, The Sibling Effect, and Lost Moon: The Perilous Voyage of Apollo 13. Lost Moon later served as the basis for Ron Howard's film Apollo 13. He has also written two young adult novels and one novel for adults, Holdout.