They've become adults(?).21-years-oldI'm hungry. Feed me something!You're a very hungry caterpillar.
The title of the book The Very Hungry Caterpillar. In the Japanese version, it's called "The Hungry Cabbageworm". There's also a pun here where Sanji replaces the "ao"(blue) in "aomushi"(cabbageworm) with "midori"(green)