Who said "Growing up doesn't mean you have to stop being yourself."?

This quote is attributed to Billy.

Growing up doesn't mean you have to stop being yourself. - Billy

"Growing up doesn't mean you have to stop being yourself."

Billy Life

"I'm a big fan of science!"

"Mandy, wouldn't it be great if we could stay young forever?"

"I love the smell of destruction in the morning!"

"Why does everything have to be so complicated?"

"Life is meant to be lived with passion."

"Life is what happens when you're busy making other plans."

"Life is a journey, not a destination."

"Life's too short for regrets."