세 살 적 버릇이 여든까지 간다
Habits (learned) at three last until one is eighty.
Used to warn that bad habits should be corrected early in life since they are very difficult to correct in later life.
어릴 때 몸에 밴 나쁜 버릇은 쉽게 고쳐지지 않는다.
What's learned in the cradle is carried to the grave.