Who said "When you're young you don't know what you don't know."?

This quote is attributed to Katy Perry.

When you're young you don't know what you don't know. - Katy Perry

"When you're young you don't know what you don't know."

Katy Perry Education

Pop Singer Songwriter American Born 1984 (age 42)

"I'm just trying to change the world, one sequin at a time."

"Just be yourself, there is no one better."

"If you don't have any shadows, you're not in the light."

"Do what makes you happy, be with who makes you smile."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."