With his wife now 47 and already the mother of three daughters with ex-husband Bruce Willis, the bigger question might be if Demi will be able to – but Ashton is in no rush.
"I think my wife is a genetic freak," he told ABC's "Nightline" on Thursday night. "I'm not worried."
Asked if they do intend to try for a baby, Ashton said, "I don't know. It's, I don't know."
Though Demi seemingly hasn't aged a day – or gained a pound – since bursting into the Hollywood scene in films such as "St. Elmo's Fire" and "Ghost," Ashton said she's not starving herself.
"What do you mean, does she eat?" he said in response to Cynthia McFadden's question. "Of course she eats!"
Related Content from AccessHollywood.com:
VIEW THE PHOTOS: Hollywood Dads
VIEW THE PHOTOS: Ashton Kutcher & Demi Moore
PLAY IT NOW: Demi Moore Talks Body Image Issue & Possibility Of Kids With Ashton Kutcher
PLAY IT NOW: Ashton Kutcher & Jennifer Garner Get Silly About 'Valentine's Day'