CHRISTOPHER: Rory might be my only child.
LORELAI: That’s not true. If Tony Randall can crank one out in his seventies you have decades left to spawn.
Tony Randall, born Aryeh Rosenberg (1920-2004) was an American actor, director, and producer. He is best known for playing the role of Felix Unger in the television sitcom The Odd Couple, earlier discussed.
In 1995 Randall, then a widower aged 75, married Heather Harlan, a 25-year-old who had worked as an intern on one of his theatre productions. The couple had a daughter and son named Julia and Jefferson, so he actually fathered two children in his seventies. Tony and Heather Randall remained married until his death.
Christopher is being overly dramatic when he says he may have lost the chance to father more children, as he’s only in his early thirties. In fact he does go on to have another daughter in a future season.