Who said "You're never too old to learn."?

This quote is attributed to Po.

You're never too old to learn. - Po

"You're never too old to learn."

Po Education

"I'm not a big fan of jokes"

"There is no secret ingredient. It's just you."

"You just have to believe"

"I'm the Dragon Warrior!"

"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."