In the car last week

DD(just turned)5: "I'm blue now!"
Me: "Huh?"
DD: "I'm 5 now so I am blue."
Me: "Huh?"
DD: "Red is 1, orange is 2, yellow is 3, green is 4, blue is 5. And I'll be violet when I'm 7! I live in a rainbow, so now I am blue. And [little brother] is only orange."