"What do you feel like is a good age to have kids?" Kylie asks Caitlyn, before giving her own answer -- 25.
"Thirty is a good age," Caitlyn replies.
But Kylie isn't too keen on that idea.
"I feel like 30 is too late," she says. "Every psychic said I'm only gonna have two kids."
"You want 30 grandchildren?" Tyga clarifies.
"Thirty grandchildren I think will be perfect, eighth's in the oven," Caitlyn jokes, referring to a then-pregnant Kim Kardashian, who was still carrying her son, Saint, at the time.
And while Kylie does express here her desire to have kids at 25, last April, a then 17-year-old Kylie said she hopes to be a mom by 27. "When I look to the far future and decide to have kids, I need to have a million girls," she told Teen Vogue. "Ten years from now -- in 2025 -- I hope I have a kid."