"I feel like 30 is too late," she says. "Every psychic said I'm only gonna have two kids."
Curiously, 26-year-old Tyga -- who already has a 3-year-old son with his ex-fiancee and Rob Kardashian's new girlfriend, Blac Chyna -- remains silent throughout the conversation. But he does chime in when Caitlyn says she wants 30 grandchildren.
"If I'm gonna get to my 30 grandchildren, you gotta have at least three," Caitlyn tells Kylie.
"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.
Of course, we now know Caitlyn already got her wish for more grandchildren! Late last month, her 37-year-old son, Burt Jenner, announced that he and his wife are expecting a baby boy.
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."